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Operator
(Operator Instructions) Good day, and welcome to the Haemonetics Corporation Second Quarter Fiscal 2023 Earnings Call. At this time, all participants are in listen-only mode. After the speaker's presentation, there will be a question-and-answer session and instructions will be given at that time. As a reminder, this call may be recorded. I would now like to turn the call over to Olga Guyette, Senior Director, Investor Relations and Treasury. You may begin.
Olga Guyette - Director of IR
Good morning, everyone. Thank you for joining us for Haemonetics' Second Quarter Fiscal '23 Conference Call and Webcast. I'm joined today by Chris Simon, our CEO; George Strong, President of our Global Hospital business; and James D’Arecca, our CFO. This morning, we posted our second quarter and first half fiscal '23 results through our Investor Relations website, along with updates our fiscal '23 guidance and the analytical tables with the information that we'll refer to on this call. Unless otherwise noted, all revenue growth rates we'll discuss today are organic and exclude the impact of currency fluctuations, strategic axes of product lines, acquisitions and divestitures. Additionally, to help investors understand Haemonetics' ongoing business performance, we will refer to non-GAAP financial measures. These measures exclude certain charges in income items. For additional details about excluded items, comparisons with the same period of fiscal '22 and reconciliations to our GAAP results, please refer to our second quarter and first half fiscal '23 earnings release posted on our IR website.
Our remarks today will also include forward-looking statements, and our actual results may differ materially from the anticipated results. Please refer to the safe harbor statement in the earnings release and other filings with the SEC for a complete lease risk factors that may impact our results. Additionally, in order to protect customer confidentiality, we will not be able to discuss any customer-specific details except as disclosed previously. And now I'd like to turn it over to Chris.
Christopher A. Simon - CEO, President & Director
Thanks, Olga. Good morning, and thank you all for joining. Today, we reported second quarter organic revenue growth of 27% and adjusted earnings per diluted share of $0.83, an increase of 38% compared to the second quarter of the prior year. Our second quarter and year-to-date results are evidence of the accelerating momentum in our businesses. The macroeconomic environment is challenging, but we have taken actions and are well positioned to navigate the headwinds. Demand for our products and services has never been stronger. We are helping fuel growth in the plasma industry by setting the standard for plasma collections, enabling our customers to collect record volumes to replenish depleted inventories. The essential value of our hospital solutions, combined with our investments are expanding our presence and accelerating growth. Our operational excellence program is driving new efficiencies and enhanced processes to help counter inflationary pressures. Through our agile, flexible global manufacturing network and resilient supply chain, we are consistently producing and delivering the products and technology our customers depend on. We are pursuing the goals we set in our long-range plan for transformational growth, diversification and sustainability.
In October, we welcomed Roy Galvin to Haemonetics as President, Global Plasma and Blood Center. His leadership and vast experience in medical technology will help drive continued strong results and long-term value creation. Turning now to the business unit results and guidance. Plasma revenue increased 58% in the second quarter and 52% year-to-date. North American disposables represent 85% of total plasma revenue and increased 63% in the quarter and 56% year-to-date, driven by strong growth in volume and price as a result of our technology upgrades. We completed our technology upgrade ahead of schedule, and the fully integrated bidirectional Nexus platform is now helping all of our long-term customers achieve effective and efficient plasma center operations while reducing their cost per liter of plasma. Volume growth was pronounced across all center types and geographies. In the U.S., volume growth was again driven by both new and mature centers with 38% growth in the quarter and 39% year-to-date for our long-term customers and is now trending above pre-pandemic levels. Similarly, Europe delivered another quarter of double-digit growth.
Our plasma business is a powerful driver of revenue growth and margin expansion, and our strong performance is a result of our market leadership with more than 10 million commercial collections and representing nearly half of all U.S. Nexus collections today, Persona is playing a critical role in helping to drive plasma volume recovery. We are committed to providing our customers with the tools necessary to win in this competitive market, and we continue to advance our innovation pipeline to further increase collection center efficiency and plasma yield while maintaining donor safety.
Encouraged by strong volume growth and the market momentum we are helping to enable, we now expect our organic plasma revenue growth to increase from our previous guidance of 15% to 20% in fiscal '23 to a range of 30% to 35%. Moving to Blood Center. Revenue grew 1% in the quarter and declined 3% year-to-date. Apheresis revenue declined 1% in the quarter and 7% year-to-date. In both periods, this business was impacted by unfavorable order timing, lower revenue from convalescent plasma, customer staffing and donor shortages at blood centers across the globe and geopolitical disruptions.
Our technology plays a critical role in improving access to noncommercial sourced plasma. Consistent with our long-range plan in the second quarter of fiscal '23, we partnered with one of our global plasma customers to expand the network of plasma collection centers in Egypt with our NexSys PCS devices. As opportunities continue to emerge like this, we are in a strong position to advance our leadership in plasma collection around the globe. Whole blood grew 7%, both in the quarter and year-to-date due to favorable order timing among distributors in Asia Pacific and EMEA and additional opportunities in North America as our resilient supply chain enabled us to serve customers in need. We are confident in the continued durability of our Blood Center business despite the challenging macroeconomic environment and reaffirm our expectation of 2% to 5% organic revenue decline in fiscal '23. Now I'll turn the call over to Stew Strong to discuss hospital results and strategic milestones. Stew?
Stewart W. Strong - President of Global Hospital
Thanks, Chris, and good morning, everyone. I'm happy to be here today to discuss our hospital business unit results and the work we are doing to drive revenue growth and further strengthen our leadership position in the markets we serve. Hospital revenue grew 22% in the quarter and has grown 18% year-to-date. Despite continued macroeconomic challenges, including staffing shortages, hospital capital budget constraints in the U.S. and Europe and continued geopolitical risk, we meaningfully grew our revenue and our market share. Haemostasis management revenue grew 11% in the quarter and has grown 8% year-to-date, driven by strong adoption and utilization of our TEG disposable products.
As a reminder, in the first half of our fiscal '22, we won a large national European tender for ClotPro, the associated shipments of capital and stocking of disposables all took place in the first half of fiscal '22, which created a difficult year-on-year comp for this part of our business in the first half of fiscal '23. Vascular closure revenue grew 42% in the quarter and has grown 39% year-to-date despite a more than typical adverse seasonality of this business during the summer months. Growth in the second quarter was disproportionately driven by new electrophysiology accounts within the top 600 hospitals, further increasing our U.S. penetration.
We're excited about the newly granted CE Mark certification for both VASCADE and VASCADE MVP that helped unlock additional attractive market opportunities outside the U.S. While there's still more work to do, we plan to begin commercialization of our vascular closure devices in Europe towards the end of this fiscal year. Our product development efforts also include inorganic investments in vascular closure, particularly in solutions for large bore arterial closure necessary for procedures such as TAVR and EVAR, this is an attractive global market that we estimate to be approximately $300 million and growing in the low teens. We have made strategic investments of EUR 30 million into a clinical stage start-up in Galway, Ireland called Vivasure Medical with an option to acquire the company upon completion of certain milestones.
Vivasure Medical has developed a clinically differentiated percutaneous large-bore vessel closure device called PerQseal, which utilizes a fully bioabsorbable patch that feels a 14 to 24 French arteriotomy from inside the vessel. The PerQseal system delivers the patch with a simple, user-friendly approach while eliminating the pre-procedure steps required for current large hole closure devices. While still early stage, clinical data shows an impeccable safety profile, and we're excited about the long-term potential of this innovative technology and the meaningful impact it may have on improving health care outcomes.
Moving on to transfusion management. Our transfusion management revenue grew 36% in the quarter and has grown 29% year-to-date. Growth in the quarter was driven by new software implementation in the U.S. and in the U.K. We will continue to leverage our commercial channels in the U.S. and Europe to grow our market share strengthened by our recently announced agreement with Epic software to offer our Safe Trace Tx enhanced transfusion management software to Epic's global network of hospital customers. And lastly, turning to cell salvage. Cell salvage revenue grew 6% in the quarter and has grown 3% year-to-date, benefiting from favorable order timing among EMEA distributors and partially offset by last year's strong capital sales. Hospital is fully on track to become our largest and fastest-growing business over the next few years. Our fiscal '23 revenue growth guidance remains unchanged, and we expect our hospital business to deliver 19% to 22% organic revenue growth versus the prior year. Thank you for your time. And now over to James to discuss the rest of our financial results and our guidance.
James C. D'Arecca - CFO, Executive VP & Financial Officer
Thank you, Stew, and good morning, everyone. Let's discuss our business results and some additional updates to our fiscal '23 guidance. Second quarter adjusted gross margin was 53.7%, an increase of 110 basis points compared with the second quarter of the prior year. Adjusted gross margin year-to-date was 54.4%, an increase of 80 basis points compared with the first half of the prior year. Adjusted gross margin both in the quarter and year-to-date benefited from volume and mix, particularly due to strong volume growth in plasma and hospital price and additional savings from our operational excellence program.
These adjusted gross margin benefits were partially offset by inflationary pressures, higher depreciation expense primarily related to finishing the conversion of all U.S. customers to our NexSys devices and some of the recent investments in our manufacturing and supply chain network. Adjusted operating expenses in the second quarter were $99 million, an increase of $17 million or 20% compared with the second quarter of the prior year. As a percentage of revenue, adjusted operating expenses decreased by 100 basis points and were at 33.3% when compared with the second quarter of fiscal '22. Adjusted operating expenses year-to-date were $198.5 million, an increase of $29 million or about 17% compared with the prior year.
The increase in adjusted operating expenses in both periods was primarily driven by increased freight volumes and costs, continued growth investments, including research and development and sales and marketing, or return to normal spending levels and higher performance-based compensation, which was partially offset by savings from the operational excellence program. Adjusted operating income was $60.6 million in the second quarter and $105.5 million in the first half, representing increases of $17 million and $24 million, respectively. As a percentage of revenue, adjusted operating margin was 20.4% in the second quarter and 18.9% in the first half, up 210 basis points and 140 basis points, respectively, when compared with the same periods in fiscal '22. Our operational excellence program is on track to deliver additional gross savings of approximately $26 million in fiscal '23 and total cumulative savings reaching $96 million by the end of this fiscal year. We expect these savings to help generate additional efficiency in both cost of goods sold and operating expenses.
The macroeconomic environment remains challenging and continues to put downward pressure on adjusted gross and operating margins, both in the quarter and year-to-date, inflation had the most pronounced effect on our financials, followed by foreign exchange. Additionally, due to the continued global supply disruptions, combined with strong demand for our products, we have had to use less efficient resources, in some cases, to ensure uninterrupted and timely supply, resulting in an adverse impact to our margins. We remain confident in our ability to offset these pressures and reaffirm our adjusted operating margin guidance in the range of 18% to 19%. The midpoint of our adjusted operating margin guidance includes higher performance-based compensation and about 350 basis points of impact from macroeconomic headwinds. The adjusted income tax rate was 22% in the second quarter and 23% year-to-date in fiscal '23, in line with the adjusted income tax rates for the same period in fiscal '22. We expect our fiscal '23 adjusted income tax rate to be approximately 23%.
Second quarter adjusted net income was $42.7 million, up $12 million or 39% and adjusted earnings per diluted share was $0.83, up 38% when compared with the second quarter of fiscal '22. Year-to-date, adjusted net income was $72.9 million, up $17 million or 30% and adjusted earnings per diluted share was $1.41, up 29% when compared with the first half of fiscal '22. The combination of the adjusted income tax rate, interest expense and FX had a negative $0.03 and $0.04 impact on adjusted earnings per diluted share in the second quarter and year-to-date, respectively, when compared with fiscal '22. We are updating our fiscal '23 adjusted earnings per diluted share guidance to be in the range of $2.70 to $3.
The midpoint of our adjusted earnings per diluted share guidance includes an approximate $0.14 headwind from volatility in foreign exchange, higher interest expense and adjusted income tax. Moving to balance sheet and cash flow. In the second quarter of fiscal '23, we entered into an accelerated share repurchase agreement to buy back $75 million of common stock under our previously announced $300 million share repurchase authorization. This share buyback helped offset dilution from existing share-based compensation programs in fiscal '23. Additionally, as you heard from Stew, we made investments in VivaSure Medical. Because of the timing of these investments, they had minimal impact on our cash on hand in the first half of fiscal '23.
Cash on hand at the end of the second quarter was $241.2 million, down $18 million since the beginning of the fiscal year, primarily due to the $75 million accelerated share repurchase program and $32 million in earnout payments related to previous acquisitions, partially offset by the $50 million revolver drawdown that was fully paid off subsequent to the end of the second quarter. Free cash flow before restructuring and restructuring-related costs were $66.3 million compared with $31.2 million in the first half of fiscal '22. The higher free cash flow before restructuring and restructuring-related costs was mainly due to higher cash flow from operating activities. These include significantly higher net income, lower inventory and higher accrued liabilities, including higher performance-based compensation.
Partially offsetting these benefits was an increase in capital expenditures as we completed the conversion of our U.S. plasma customers to NexSys and continue to make improvements to our manufacturing and supply chain network as part of our operational excellence program. We believe in our ability to generate strong cash flow and update our guidance for free cash flow before restructuring and restructuring-related costs for fiscal '23 to be in the range of $150 million to $180 million compared with our prior guidance of $100 million to $130 million.
The updated guidance reflects higher net income and additional benefits from the net working capital in fiscal '23. Our earnings and cash flow are exposed to interest rate risk. As part of our risk management strategy, we use interest rate swaps to mitigate our exposure to volatility in interest rates, which we believe is especially prudent in this economic environment. In our second quarter, we refinanced our existing credit facilities and entered into additional interest rate swap agreements that extend through mid-June 2025. These interest rate swaps secure an average blended fixed interest rate of 3.57%, plus the applicable spread on 70% of the notional value of the unsecured term loan until mid-June of 2023. Thereafter, the average blended fixed interest rate increases to 4.12% plus the applicable spread on 80% of the notional value until mid-June of 2025. Our net leverage ratio at the end of the second quarter was 2.7%.
In summary, I'd like to conclude with a few closing thoughts. We are excited about the opportunities ahead and remain focused on our short-term and long-term goals, including delivering robust revenue and adjusted EPS growth and strong free cash flow generation. Our second quarter and first half results show continued strong demand for our products and resilience of our supply chain despite the challenging macro environment. In our collections business, Plasma and Blood Center, our technology is playing a vital role in helping our customers address critical blood shortages and depleted inventories. In hospital, in addition to delivering breakthrough results across all of our product lines, we continue to make organic and inorganic investments to further strengthen our leadership and expand our share. The operational excellence program is fully on track and is expected to generate $115 million to $125 million in total gross savings by its completion in fiscal '25. And finally, our balance sheet remains strong with ample liquidity to support our short- and long-term capital allocation priorities. Thank you. And now I would like to open the line for Q&A.
Operator
Thank you (Operator Instructions) Our first question comes from Anthony Petrone with Mizuho.
Anthony Charles Petrone - MD of Senior Medical Devices, Diagnostics & Therapeutics Equity Research Analyst
Great. And congratulations on a very strong quarter here, and I hope everyone is doing well. First couple will be either for Chris or Roy on plasma and just the numbers for the quarter, obviously, North American volumes’ up substantially. But maybe just the optics of the overall number for this quarter, how much was contributed by price versus volume? That would be the first question. And when we think about the volume games here, maybe a little bit on the recession and inflation tailwinds to the plasma business. And when did the company start to see those come into the mix here and what would be the expectation for how long those tailwinds could last? And I'll have one quick follow-up.
Christopher A. Simon - CEO, President & Director
Anthony, it's Chris. Welcome back. Great to have you in the mix. In terms of plasma, yes, we have now collected more in the quarter than we did in the equivalent quarter prior to the pandemic. So recovery is fully underway. The outperformance in the quarter was a mix of both volume and price to price being associated with the completion ahead of schedule of our technology upgrades to NexSys and now fully half of our collections happening on our Persona technology. So volume was by far the major driver, but clearly, our mix is helping as well. In terms of what's happening in the macro environment, as we said in our prepared remarks, all centers participated, mature and new alike. It's important to recognize that we have twice as many new centers as a percentage of our total support at centers than we had pre-pandemic, and they're growing at exactly the historic rate. So it feels good.
Southern border is back, not to its pre-pandemic levels, but the trajectory actually is more robust than we had anticipated at this point in the year. So it really feels like we're hitting on all cylinders. I do think this is a bit of a contrarian story regardless of what happens in the macro environment, the combination of inflationary pressures, potential recession, consumer sentiment being at all-time low, has really motivated the donors to return. And our customers are doing everything in their power to take advantage of that and to grow I don't want to meet current patient need, but to replenish inventories for the ongoing growth that they see in IG-based therapy. So it's a robust time for sure, and we expect that tailwind to continue for the foreseeable future.
Anthony Charles Petrone - MD of Senior Medical Devices, Diagnostics & Therapeutics Equity Research Analyst
The follow-ups would be there, Chris, just on the notion on inventory build fractionators clearly went through a period of record low levels of inventories out of the pandemic. Any way to sort of estimate where they are in replenishing inventories and safety stock, how long it may take for them to get back to a pre-pandemic level? And then the last question for Stewart, just quickly on Cardiva, received the CE mark in September. Any color on the early launch days across Europe for Cardiva, that would be helpful. Congratulations again thanks.
Christopher A. Simon - CEO, President & Director
Thanks, Anthony. So on inventory levels with our customers, they hold that close to the best, as you can appreciate. So we're going to respect and honor that as well. But I think in the current environment where the demand for IG-based therapies is so strong, the end market demand for their products, I think inventory winds up taking on a real strategic role that allows customers to bid for contracts and tenders that they might not otherwise be able to. And I think inventory matters a lot to all of our customers. They are at various stages of recovery. I think all of them have aspirations to grow their inventory levels from where we sit. And we'll watch closely not be new center openings and doing a remuneration, but we don't see any abatement near term, for sure. Stew?
Stewart W. Strong - President of Global Hospital
Yes. Anthony, thanks for the question. We're excited about the CE Mark that we got. We plan to begin commercialization in Europe toward the end of this fiscal year. The CE Mark, as you've heard from me before, represents a huge opportunity for us, particularly in EP, in Europe. It's about a $1.3 billion TAM globally. Europe is a significant part of that. So we're excited about that launch. Right now, we're going to target the markets that have the best conditions for launch. That comes down to volume comes down to clinical and economic value in the country as well as pricing and reimbursement. So those are the countries we're going to go after first. But just like we did in the U.S., we're going to take a very disciplined approach to the launch in Europe and make sure we focus on the areas that are most opportune for us to launch it.
Operator
(Operator Instructions) Our next question comes from Drew Ranieri with Morgan Stanley.
Andrew Christopher Ranieri - Equity Analyst
Chris, maybe for you, and I know you don't necessarily want to get on specifics for pricing. But as you're thinking about the guidance raise in plasma, could you just help us maybe parse out a bit of what the expectation is for pricing now that NexSys has kind of fully rolled out earlier than expected. And I think you mentioned Persona was now 50% of collections. So how should we maybe think about that being a benefit into the back half of the year? And I have a couple of follow-ups.
Christopher A. Simon - CEO, President & Director
Yes. Thanks, Drew. Appreciate the questions. The technology upgrade has gone exceptionally well. There's clearly value to our customers from the combination of NexSys and NexSys with Persona, and that's reflected in the contracts that we've entered into. There's an annualization and some of that is occurring as we speak. But when you look at where we are year-to-date this fiscal year, halfway through, both volume and price have been meaningful contributors. We think Personas’ the answer across the board, we originally were targeting an enhanced safety profile by tailoring in more of a personalized medical way, how we do the collections. In addition, you get a 10% to 12% gain in yield, which is significant as all strive to replenish as we talked about already on this call. So we'll continue to lean into that.
There's a number of things that have to happen for our customers, remaining customers to adopt that. But we feel quite good. As the year goes on, the NexSys conversions will annualize. We're cautiously optimistic that we'll see additional opportunities for Persona over the next 1.5 years. And as that comes to fruition, we'll guide accordingly.
Andrew Christopher Ranieri - Equity Analyst
Got it. And then just with expectations actually for 2024, are you still confident of delivering top line and bottom-line growth and just in plasma kind of given all these tailwinds that you now have at your back? And could you see another 30% year looking ahead at next year? And with vascular closure just with the CE Mark, how should we kind of think about that as supporting or enhancing kind of the growth rate trajectory that you're currently on?
Christopher A. Simon - CEO, President & Director
Yes. Thanks, Drew. I know there is a lot of interest in our ability to continue to grow. And I think earlier this year, when our guidance was a little more modest, I think there was a question about '22 versus FY '23. I think now with the revised guidance that James communicated this morning, the midpoint would suggest double-digit growth off of '22. Within that, we're guiding 30% to 35% revenue growth on plasma our long-term customers are growing in excess of that, closer to 40%. So it's coming together nicely. In short, while it's way too early to guide for FY '24, we don't have any confidence about our ability to continue the growth trajectory that we're on. And we'll continue to watch this. Macroeconomic factors loom large. And in the main, they're a positive for us, and I'm happy to break that down if it's helpful. But there's also a cost side of that where our teams are battling inflation and supply chain and FX as every company is, they're doing an outstanding job of mitigating those factors, but it's expensive, and that's reflected in our guidance as well.
Operator
Our next question comes from Andrew Cooper with Raymond James.
Andrew Harris Cooper - Research Analyst
Great. Maybe first just starting with the investment in Devitre, can you give us a little bit more of a sense of -- is that something that could be additive as a technology when you think about bringing potentially VASCADE and that capability together? And maybe a little bit around the thinking of why not acquire outright earlier, what's the structure of your right to buy later is and just how synergistic that could be to add large bore to what you already have as well.
Stewart W. Strong - President of Global Hospital
Yes. So it is very synergistic to the Basket platform, Andrew. So when we think about PerQseal, that will round out our closure portfolio and really complement VASCADE and VASCADE MVP. It will give us a closure option for large bore that we currently do not have in the VASCADE platform, okay? So that's a key element to the purchase of this company potentially. It also adds to the TAM that this large bore closure is for TAVR and EVAR. It's about a $300 million global total addressable market. So it opens up more of an addressable market for us for large bore closure. And then I would say, as it relates to the option to purchase, we can exercise that option as early as we'd like to. However, we're choosing to wait until we see the results of their IDE trial before we move forward with the potential to exercise the option.
Andrew Harris Cooper - Research Analyst
Okay. Great. And maybe just one more attempt to sort of slicing this. Just trying to get a sense for maybe when some of the Persona contracts went online and how we should think about the impact on growth moving forward in terms of the step-up of getting everybody on NexSys just getting everybody on for so can you -- when we think about the volume growth versus price, just is there any other flavor you can give us for timing and how we should expect that to roll on in the back half of the fiscal year? And I'll stop there.
Christopher A. Simon - CEO, President & Director
And you're happy to do that, and I'm going to add a comment about the Vivasure question and M&A more broadly, if I might as well. In terms of Persona NexSys, we have completed the NexSys upgrade cycle. We got done in mid-August, fully ahead of schedule and feel great about that. So the process will play forward as we upgrade a center, the pricing follows. So we feel good about the trajectory we're on. As I said, it's included in our guidance. For Persona, we don't include anything in our guidance that's not already fully contracted. We're having discussions with all of our customers about the technology.
Different customers are at different stages of assessment, and we'll play that forward and be as supportive as we can for customers as they do that assessment and ready their supply chains and their organizations for the changes that are associated with that increased 10% to 12% yield. So stay tuned, additional guidance. We're not going to break down, as Olga said, at the outset for reasons of customer confidentiality, we're not going to talk specifically about price versus volume, but it will be included in our guidance. We'll try to give you a sense for that. You can certainly see it passing through on our gross margin.
The point I would add to Stew's answer is we are really focused, first and foremost, about building out our presence and our relevance to the customers that we serve. We're committed to programmatic M&A. Vivasure is an example of that. Our general preference is a real company with real revenues that substantially de-risked. Unfortunately, that's everybody's priority. So in this case, we went earlier because we have a good sense for the potential of the technology and as that potential becomes a reality, we have the option to act. We are strategic investors. We're not financial investors. So this is about building out our portfolio, augmenting R&D with inorganic growth through M&A.
Operator
Our next question comes from David Turkaly with JMP Securities.
David Louis Turkaly - MD & Equity Research Analyst
I'll give my shot here just contribution. So you said I think that your disposable North American volume was up 63%. And I think you called out 38% volume and mathematically, if we take the difference there, the $25 million. I mean, is that sort of a ballpark of what we're talking about as a price contribution in terms of how it impacted the number in the quarter?
Christopher A. Simon - CEO, President & Director
Yes. I think the difference, Steve, and I realized we threw a lot out there in the prepared remarks, we are separating long-term customers out, and that's what the breakdown we gave you. So it's not as straightforward as the math you're trying to do. And as I said, I just don't want to get into that much more detail around it. But I know there's ongoing questions about robust and the sustainability given the steep trajectory that we're on. And that's why we wanted to give you the long-term number in addition to the overall market number.
David Louis Turkaly - MD & Equity Research Analyst
Got it. And then just to clarify, you made a comment about the new centers, maybe there being twice as many from maybe pre-pandemic I was wondering if you could give us any color on sort of the mix split there between the mature versus the new -- how big are each of those in terms of the total business today?
Christopher A. Simon - CEO, President & Director
Yes. So historically, the mature centers reach a practical capacity and substantially all of the growth in the industry has been driven by new center openings and there's a 3- to 4-year ramp depending on the company as those centers come up to speed. What we observed during the pandemic was the rate of new center openings was double what it was in the prior years as customers leaned in and did what they could to reach more donors in more geographies. In particular, we're seeing smaller centers in terms of the number of devices, number of beds, and in slightly smaller metropolitan areas and surrounding metropolitan areas.
Today, there are roughly 250 new centers, somewhere on that 3- to 4-year trajectory and they're performing at least equivalent to what new centers have always performed that. In addition, as I said in the prepared remarks, we're seeing growth from mature centers. They're not back to pre-pandemic levels. There's more opportunity there. But in totality because of the significant up-step in new centers, we actually collected more plasma in the second quarter than we did in the second quarter of 2020, which was our peak year prior to this.
Operator
(Operator Instructions) Our next question comes from Mike Matson of Needham & Company.
Michael Stephen Matson - Senior Analyst
Just a few on gross margin. So I know you gave guidance for -- or reiterate the guidance for the operating margin, but just looking at kind of where you're at in the September quarter here for the second half of the year, is it reasonable to assume the gross margin kind of being like that 53% to 54% sort of range?
Christopher A. Simon - CEO, President & Director
Yes. Thanks, Mike. Yes, we typically haven't guided here on gross margin. But yes, if we're going to hit our operating margin guidance, those gross margins that you see will have to be in that continued area. So I mean gross margin for us has improved mostly because of mix. pricing gains that we've had. But the flip side of it has been what I spoke about in my remarks in that because the volume growth has been much greater than we initially planned this year, it's caused some inefficiencies for us in the supply chain. So it's less timely notice to vendors, more use of air freight and overall less efficient utilization of resources like sterilization capacity and so forth. So all those kind of take you back a little bit. But on balance, yes, you'll see those gross margins, I think, hanging in there.
Michael Stephen Matson - Senior Analyst
Okay. And then at your Investor Day, you guided to, I think, like a high 50% to low 60% range for fiscal 2016. And I know that, that's a ways off still. But I'd imagine that some of these pressures probably continue into your fiscal '24. So do you still think you can reach those targets in '26?
Christopher A. Simon - CEO, President & Director
Yes, we do. That will come from selling higher profitable products. That's going to continue no matter what, as we go on here as we grow. But also on the macro level, we are assuming that once we get out to 25 and 26, that we do have some easing of those inflationary pressures that we experienced so significantly during the early part of the pandemic here.
Michael Stephen Matson - Senior Analyst
Okay. And then I know you said you're not going to comment on specific customers, but I'll ask one on CSL anyway because you have quantified that in the past. So are you still expecting them to do $88 million with you of sales this year? Or I mean just given the tremendous demand in plasma volumes, is that going end up being higher than that? Or are they locked in at that amount?
Christopher A. Simon - CEO, President & Director
Yes, Mike, I appreciate the interest here and getting to the core of the sustainability of our outperformance. The $88 million is a minimum contractual agreement. That hasn't changed. CSL and all of our customers are experiencing robust growth. As we've said, across centers, mature and new alike. Certainly, CSL is doing their part and driving accordingly, and we're benefiting from that as well. Okay. Sorry, I didn't realize that was a minimum. All right.
Operator
There are no further questions at this time. This concludes our question-and-answer session. Thank you for your participation in today's conference. You may now disconnect. Everyone, have a great day.