Jonathan J. Mazelsky
President, CEO & Director at IDEXX Laboratories
Thank you, Brian, and good morning. We're pleased to report another quarter of excellent results for IDEXX, driven by sustained momentum in our CAG business. We delivered double-digit organic revenue growth overall, supported by 11 and a half percent organic CAG Diagnostics recurring revenue growth compared to very strong prior year growth levels. two-year average annual organic growth rates across testing modalities were in line with growth in the first half of 2021, with clinical visit trends sustaining above pre-pandemic levels. These strong trends are evidence that veterinary practices worldwide continue to focus on elevating standards of care by leveraging IDEXX's advanced product and service platforms. The IDEXX team is doing an outstanding job supporting continued high growth in customer service levels, putting us on track towards 2021 financial performance at the high end of our previous outlook and above our long-term goals. Today, I'll highlight key areas of progress in our product and commercial initiatives that position us to deliver continued high growth and strong financial returns. Let's begin with a brief update on sector trends. Positive Companion Animal health care trends continued in the third quarter, building on the accelerated demand levels achieved throughout the pandemic. U.S. clinical visit growth wastwo percent in Q3 compared to strong 7 percent prior year third quarter growth levels, which included benefits from pent-up demand. To normalize for prior year pandemic dynamics, we are monitoring 2-year average annual growth rates, which were 4.4 percent in Q3, continuing above the pre-pandemic levels oftwo percent to 3 percent. Wellness clinical visit growth of 6 percent on a 2-year basis points, the continued adoption of a preventive approach to pet health care, the sustained underlying momentum reflects the continued strengthening of the pet-owner bond, the benefit of stepped-up growth in the pet population beginning early during the COVID-19 pandemic through early 2021 and sustained focus in the veterinary clinic and medical services.
Around the world, veterinarians passion for their work combined with pet owner desire for excellent care have driven this focus on services as they remain extremely busy. U.S. practice revenue growth in the third quarter advanced a healthy 7 percent versus the prior year and an even more impressive 9 percent on a 2-year basis, supported by 2-year average growth of 1one percent in clinical revenue and 13 percent in diagnostic revenue. Customers are clearly attracted to IDEXX's broad portfolio of products and services to support elevated levels of demand while also growing their practices. These positive dynamics are also true in our international regions. IDEXX's growth is sustaining at an even stronger rate reflected in the 16 percent 2-year average annual growth in CAG Diagnostics recurring revenues in Q3, a premium of nearly 1,200 basis points above 2-year average clinical visit growth rates. High levels of execution and consistently strong sector trends reinforce our confidence in sustaining strong growth momentum as we finish the year and build our plans for 2022. Outstanding commercial execution has been a key driver of our business performance, and our team continues to support our customers at a high level. This is evidenced by 36 percent year-on-year growth in premium instrument placements in Q3, a record number of third quarter placements for the company. High growth across our Catalyst, ProCyte and SediVue platform supported a 14 percent overall year-over-year increase in our premium installed base. Veterinarians are using IDEXX's diagnostic tools to build capacity and improve efficiency within the clinic to support future growth, which is also reflected in high levels of second Catalyst placements and continued strong 16 percent gains in Catalyst placements at new and competitive accounts.
Our strong global instrument placement momentum has long-term benefits and gives us further confidence that future consumable streams will also support continued strong growth. These results were achieved despite continued constraints on direct access to customers. Time for our customers is a scarce and valuable resource. In-person sales trends remain at approximately 60 percent in the U.S. and slightly lower in Europe at over 50 percent. Despite these constraints, our teams are in high levels of connection to our customers to deliver exceptional results by leveraging their trusted long-term relationships as highly relevant partners. We continue to enhance our commercial capabilities, the roll-in country level expansions of our field sales force to build on these results and to address the significant opportunities ahead of us. We've completed our expansions in Germany, France and South Korea and are seeing significant positive traction in instrument placements and CAG recurring revenue growth in these countries as a result. In addition, we are expanding our footprint in three additional countries, as noted on our last call, with hiring, onboarding and training tracking well to our plans in those areas. We expect to be live in all second wave countries by the end of Q1 of next year. In addition to our commercial footprint, we made progress in the past quarter in expanding our service footprint and capabilities in order to better support international business and customers. This included targeted investments to expand our European reference lab network and enhance our telemedicine service. These capabilities will support our long-term growth goals by ensuring we meet our customers' needs with a broad network and comprehensive portfolio of services, complementing our world-class reference lab facility in Kornwestheim, Germany.
These advancements support high growth across our testing modalities as customers continue to take advantage of the flexibility offered by our customer-centric programs, such as IDEXX 360, to grow their businesses and elevate standards of care around the world. Innovative products like ProCyte One, are helping to build on this momentum. We've seen a very strong response to ProCyte One, having delivered over 1,000 units worldwide since launch and on track for the approximately 4,000 annual worldwide premium hematology placement pace we shared during Investor Day. Feedback from customers of all sizes have been overwhelmingly positive as they rave about ProCyte One's easy use, well maintenance profile and excellent performance. Our growth trajectory now reflects launches in all four of our major regions with a select number of country launches remaining in the fourth quarter of this year and into 2022. ProCyte One provides a great opportunity for increased engagement with customers, supporting strong adoption of this new platform globally and a broader expansion of our business relationships. As an example, almost 95 percent of worldwide ProCyte One placements and nearly 100 percent in North America have either included a Catalyst One or have been placed at a customer that already has a Catalyst One, demonstrating the strong multiplier effect of this innovative product. Our Rapid Assay business is another area, which provides an opportunity to expand relationships with customers around the globe. Rapid Assay test revenues grew solidly in Q3 compared to a very strong prior year, and 14 percent on a 2-year basis with comparable gains in the U.S. and internationally. Vector-borne disease testing, a critical component to the Rapid Assay business and a wellness testing in the U.S. more broadly, was the primary driver of this growth as tick-borne disease becomes more prevalent in regions around the U.S. This testing growth continues to be supported by the SNAP Pro instrument, which helps drive engagement and loyalty through enhanced insight, accuracy and practice workflow benefits.
Double-digit growth in the SNAP Pro installed base in the U.S. and internationally and recent innovations like critical decision support, which aids increasingly busy veterinarians in making critical decisions when faced with a positive test, have helped drive excellent 97 percent customer retention levels within the Rapid Assay business. Our innovation strategy is also reflected in the expansion of our cloud-based software capabilities, which benefited from the Q2 acquisition of ezyVet. The integration of ezyVet into our software portfolio is proceeding to plan with high customer enthusiasm. ezyVet acquisition helped drive 33 percent reported growth of veterinary software, services and diagnostic imaging systems revenue in the third quarter, which was further supported by strong 15 percent organic growth in our core software and digital imaging products. This growth reflects solid double-digit year-over-year gains in our profitable recurring revenue software products. It also demonstrates the benefit of a growing installed base of PIMS in industry-leading low-dose diagnostic imaging products. Cloud-based offerings represent the majority of PIMS placements at over 80 percent as cloud-based offerings provide performance, quality and life cycle cost advantages. And within Diagnostic Imaging, recent updates to the Web PACS product include additional features important to specialty practices and deeper, more seamless integrations with PIMS systems. With a growing installed base and very high retention levels, IDEXX Web PACS has become an important part of our enterprise software ecosystem, product enhancements like this and others aimed at making clinical workflow and customer communications easier and more efficient are an impactful example of how our Technology for Life approach is supporting busy practices. Our commercial sales force and marketing teams continued to balance product sales with advancing the IDEXX Preventive Care program, which provides a structure and incentive for our customers, continue driving wellness testing and raising the standard of care. Enrollments in this program in the third quarter, despite constrained in-person discussions with customers, sustained at a rate similar to the second quarter as we executed approximately 150 new preventive care enrollments and continue to track towards our goal of 10,000 engaged customers in the U.S. by 2024.
In addition to strong commercial execution, our consistent growth trajectory also reflects resiliency and agility in our supply chain. This has enabled us to weather the impacts of the COVID-19 pandemic and meet the strong demand within our sector. IDEXX benefits from a number of factors related to our business, including strong long-term supplier relationships, nearshoring and product standardization and inventory buffers. These factors and their proactive approach managing frontline operational processes have allowed us to achieve 99 percent customer product availability through the pandemic, resulting in high customer satisfaction and increased retention. We believe we are well prepared to support sustained high growth and service levels in our business going forward, where there may be relatively higher cost in certain areas to support our growth plans, we are confident we can manage these impacts effectively through our operational capability and focus while building on our strong financial performance. Overall, we feel very positive about our continued strong business momentum as we engage with and support veterinarians around the world who are advancing the care standard. Looking forward, we are proceeding with plans for sustained high growth aligned with our long-term growth potential as current momentum positions us well to support investments in the infrastructure, solutions and commercial capabilities necessary to achieve the significant opportunity ahead of us while delivering continued strong financial performance. Finally, I'd like to thank our employees and our customers for their perseverance and flexibility during these dynamic times. I'm extremely proud of what we've accomplished together and look forward to continued excellence in the future. That concludes my remarks, and we now have time for questions.