Brian P. McKeon
Executive Vice President, Chief Financial Officer at IDEXX Laboratories
Good morning, and welcome to our third quarter earnings call. Today, I'll take you through our Q3 results and review our updated financial outlook for 2024.
IDEXX delivered solid organic revenue growth and strong comparable profit gains in the third quarter. In terms of highlights, overall revenues increased 6% organically, supported by 7% organic growth in CAG Diagnostic recurring revenues and 13% organic growth in our water business. Organic revenue gains were supported by benefits from IDEXX execution drivers, reflected in consistent solid new business gains, sustained high customer retention rates and double-digit growth in our premium instrument installed base.
While not reported in our quarterly results, IDEXX secured nearly 700 orders for our new inVue analyzer, which supported strong growth in EVI metrics that will position the Company to build on this momentum. Partially offsetting these benefits, CAG Diagnostic recurring revenue growth in Q3 was constrained by impacts from near-term US macro and sector headwinds.
As we'll discuss, we're updating our full year organic revenue growth guidance to reflect expectations for continued near-term macro and sectoral pressure in the US and to incorporate estimated negative impacts from recent severe weather events.
IDEXX continues to deliver strong profit performance, as we work through these dynamics, reflected in solid comparable operating margin gains in Q3, keeping us on track to achieve our full year operating margin goals. Solid revenue growth and operating margin gains supported EPS of $2.80 per share in Q3, up 11% as reported and 12% on a comparable basis.
We'll review our updated guidance detail later in my comments. Let's begin with a review of our third quarter results. Third quarter organic revenue growth of 6% was driven by 6% organic revenue gains in our CAG business and 13% organic growth in water, partially offset by 2% organic declines in LPD. CAG organic revenue growth was supported by 6% organic gains in veterinary software, services and diagnostic imaging revenues, driven by 11% organic growth in recurring revenues. CAG instrument revenue decreased 9% organically, reflecting comparisons to record prior year placement levels and near-term impacts from our commercial focus on IDEXX inVue order generation, which will primarily benefit 2025 reported instrument revenues.
Worldwide CAG Diagnostic recurring revenue increased 7% organically in Q3. This includes approximately 1% of global equivalent day growth benefit in the quarter related to increased shipping days in our in-clinic business. Q3 CAG diagnostic recurring revenue growth was supported by average global net price improvement of approximately 5% with US net price realization of approximately 4%.
US net price realization includes impacts from the successful extension and expansion of three major customer agreements in 2024. These agreements will provide long-term incremental volume growth benefits for IDEXX as we expand our business relationships with these customers. CAG Diagnostics recurring revenue growth in the third quarter was supported by 10% international organic gains. International growth reflected benefits from net price realization, continued solid volume gains and approximately 0.5% of positive equivalent days effects.
International growth was driven by IDEXX execution, reflected in continued strong new business gains and high premium instrument placements, which supported a double-digit year-on-year expansion of a global premium instrument installed base. US CAG diagnostic recurring revenue organic growth was 5% in Q3, including approximately 1.5% of growth benefit from equivalent days effects.
US growth was supported by continued solid positive growth contribution from new business gains, sustained high customer retention levels and benefits from net price realization. IDEXX's US growth expanded at a solid premium to comparable US same-store clinical visit growth levels. In the US, we continue to work through macro and sector dynamics, which contributed to a 2.1% decline in same-store clinical visit growth in Q3, including a relatively higher 3.4% same-store decline in more discretionary wellness visits. Overall, US clinical visit growth levels include an estimated 1% to 1.5% growth benefit from the ramping of pain medication visits over the last year, which typically do not include diagnostics. This is added to the near-term clinical visit headwind effect for IDEXX's US CAG business.
For pets visiting US clinics, pet owners continue to demonstrate interest in a higher standard of care, despite macro pressures. If we adjust US sector metrics for the estimated pain medication impact on clinical visits and diagnostic frequency, we continue to see an increase in the percentage of visits that include at least one diagnostic.
Over the last 12 months, the percentage of clinical visits with core blood work inclusion has also sustained at elevated levels following the accelerated expansion seen during the pandemic. These trends reinforce that the primary headwind to IDEXX's growth in the near term remains pressure on clinical visit growth.
Given recent trends and our updated full year organic growth outlook, we factored in expectations for continued near-term constraints on CAG Diagnostic recurring revenue growth from US macro and sector impacts. IDEXX continues to achieve solid organic growth and strong financial performance as we work through these near-term headwinds. We're highly confident in the positive long-term drivers of demand for diagnostics, including the future benefits that will flow from IDEXX innovation, as we continue to execute towards our business strategy aligned with raising standards of pet healthcare globally.
In terms of growth by modality, third quarter results were supported by strong global gains in consumable revenues. IDEXX VetLab consumable revenues increased 11% organically, reflecting double-digit gains in the US and international regions, including benefits from increased equivalent shipping days effects.
Consumable gains were supported by 10% year-on-year growth in our global premium instrument installed base, reflecting strong gains across our catalyst, premium hematology and SediVue platforms. We achieved 4,128 CAG global premium instrument replacements in Q3, a decrease of 443 units or approximately 10% compared to record prior year levels, while securing 691 orders for our new IDEXX inVue analyzer in North America. We're on track for initiation of shipments of inVue in Q4 with expectations for approximately 50 shipments to 100 shipments this year with the bulk of the advanced orders targeted for delivery in 2025.
Global rapid assay revenues expanded 6% organically in the third quarter, reflecting solid global gains, including benefits from net price realization and positive equivalent shipping days effects. Global lab revenues increased 2% organically in Q3, net of a modest equivalent days headwind, reflecting low-single-digit gains in the US and solid growth in international regions.
Reference lab results adjusted for days effects were supported by modest volume growth, aided by new business gains, which offset pressures related to macro and sector conditions constraining same-store sales levels. Net price gains in our reference lab line of business in Q3 were moderated by impacts from major new customer agreements, which will benefit long-term reference lab growth.
Veterinary software, services and diagnostic imaging revenues increased 11% as reported, including benefits from our recent Greenline software and data platform acquisition. 6% overall organic revenue gains were driven by 11% organic growth in recurring revenues, reflecting benefits from ongoing momentum in cloud-based software solutions.
Water revenues increased 13% organically in Q3, supported by double-digit gains in the US and continued solid growth in Europe. Livestock, poultry and dairy revenues decreased 2% organically, as strong gains in the US were offset by lower Asia swine testing and herd health screening revenues.
Turning to the P&L, Q3 profit results were supported by solid gross margin gains. Gross profit increased 9% in the quarter as reported and 9% on a comparable basis. Gross margins were 61.1%, up a 140 basis points on a comparable basis. Gross margin gains reflect favorable business mix, including benefits from high growth in consumable revenues, lower instrument costs and favorable impacts from growth in veterinary software, services and diagnostic imaging recurring revenues.
Operating expenses increased 7% in the quarter on a reported basis and 8% on a comparable basis. Opex growth was driven by increases in sales and marketing expense and R&D spending aligned with advancing our growth and innovation agenda. Operating margins were 31.2% in the quarter, up a 110 basis points year-on-year as reported and 100 basis points on a comparable basis.
EPS was $2.80 per share in Q3, an increase of 11% as reported and 12% on a comparable basis. Foreign exchange increased revenue and operating profit by approximately $1 million and EPS by approximately $0.01 per share in the quarter, net of a $1 million hedge gain.
Free cash flow was $192 million in Q3. On a trailing 12-month basis, our net income to free cash flow conversion ratio was 91%. For the full year, we're maintaining our outlook for free cash flow conversion of 90% to 95%, while updating our full year outlook for capital spending to approximately $160 million, reflecting lower projected spend and project timing.
Our balance sheet remains in a strong position. We ended the quarter with leverage ratios of 0.7 times gross and 0.4 times net of cash. In the third quarter, we allocated $225 million in capital to share repurchases, supporting a 1.1% year-on-year reduction in diluted shares outstanding.
Turning to our 2024 guidance. We've updated our full year overall organic revenue growth outlook to 5.3% to 6% and our outlook for CAG Diagnostic recurring revenue growth to 5.8% to 6.4%. At midpoint, this reflects a reduction of 1% to 1.5% compared to our prior full year organic revenue growth outlook, primarily driven by recent US macro and sector trends constraining visits and demand at the clinic level. This outlook incorporates Q3 results and reflects expectations for continued pressure on US CAG Diagnostic recurring revenue growth in Q4 related to macro and sector trends and recent severe weather impacts.
In Q4, at midpoint, the updated outlook reflects expectations for overall organic revenue growth of approximately 3%. This aligns with a Q4 midpoint expectation for global CAG Diagnostic recurring revenue growth of 3.5% to 4%, net of an estimated 0.5% of negative effect from severe weather impacts in the US. We expect global net price improvement and CAG diagnostic recurring revenues of approximately 4% to 4.5% in Q4, including effects from new business agreements with a consistent outlook for approximately 5% full year global net price realization.
Our updated full year guidance for reported revenues is $3,865 million to $3,890 million, a reduction of $38 million at midpoint. Our updated reported revenue outlook includes a favorable $15 million adjustment related to more recent FX estimates.
In terms of our profit guidance, our outlook for 28.7% to 29% in reported operating margins reinforces our full year goals for solid comparable operating margin improvement. Our full year reported margin outlook incorporates effects from the discrete litigation expense accrual recorded in Q2, which will reduce full year reported operating margins by approximately 160 basis points and EPS by $0.56 per share. Excluding this impact and FX effects at midpoint, our operating margin outlook reflects a consistent 40 basis point to 50-basis point improvement in comparable operating margins, net of a negative 40-basis point impact related to the lapping of the Q1 2023 customer contract resolution payment.
Our updated full year EPS outlook of $10.37 per share to $10.53 per share is consistent with our prior EPS guidance at midpoint. At midpoint, we've incorporated approximately $0.14 and negative EPS impact from the reduction to our organic revenue growth outlook, offset by $0.02 in favorable foreign exchange adjustments, $0.01 in favorability related to updated interest expense estimates and a positive $0.11 per share benefit from improvement in our outlook for our effective tax rate. Our updated effective tax rate estimate includes approximately 0.5% of full year rate benefit or approximately $0.06 per share from a non-recurring tax reserve release we expect in Q4 as a result of the lapsing of an applicable statute of limitation.
That concludes our financial review. I'll now turn the call over to Jay for his comments.