Glenn A. Eisenberg
Executive Vice President and Chief Financial Officer at Laboratory Co. of America
Thank you, Adam. I'm going to start my comments with a review of our third quarter results, followed by a discussion of our performance in each segment and conclude with an update on our full year guidance. For reference, we've also included additional business information that can be found in our supplemental deck on our Investor Relations website. Revenue for the quarter were $3.1 billion, an increase of 6.6% compared to last year, primarily due to organic base business growth and the impact of acquisitions, partially offset by lower COVID testing. The base business grew 14% compared to the base business last year, while COVID testing revenue was down 87%.
Organically, in constant currency, the base business grew 10.8%, benefiting from the Ascension lab management agreement, which contributed approximately 4% of the organic growth. As a reminder, the outreach business that we acquired from Ascension is treated as an acquisition while the lab management agreement is treated as organic growth. Ascension annualized on September 30. Operating income for the quarter was $252 million or 8.3% of revenue. During the quarter, we had $56 million of amortization and $116 million of restructuring charges and special items due to the spin of Patria, COVID, acquisitions and LaunchPad initiatives.
Excluding these items, adjusted operating income in the quarter was $424 million or 13.9% of revenue compared to $491 million or 17.1% last year. The decrease in adjusted operating income was due to lower COVID testing. The margin decline was also negatively affected by the mix impact from the Ascension lab management agreement. Excluding these items, margins would have been flat as the benefit of demand and LaunchPad savings were offset by higher personnel expense. Our LaunchPad initiative continues to be on track to deliver $350 million of savings over the three-year period ending 2024. The tax rate for the quarter was 23.1%. The adjusted tax rate for the quarter was 24% compared to 19.4% last year.
The increase in the adjusted rate was primarily due to higher R&D tax credits realized last year. We continue to expect the fourth quarter and full year adjusted tax rate to be approximately 24%. Net earnings for the quarter from continuing operations were $184 million or $2.11 per diluted share. Adjusted EPS were $3.38 in the quarter, down 16% from last year due to lower COVID testing earnings as base business adjusted EPS was up approximately 10%. Operating cash flow from continuing operations was $276 million in the quarter, which was burdened by approximately $56 million of spin-related items. Operating cash flow of $276 million is up from $253 million a year ago due to higher cash earnings. Capital expenditures totaled $105 million, up from $83 million last year.
For the full year, we continue to expect that capital expenditures will be approximately 3.5% of base business revenue. Free cash flow from continuing operations for the quarter was $171 million, which was burdened by approximately $56 million of spin-related items. The company invested $380 million in acquisitions, paid out $64 million in dividends and used $1 billion for an accelerated share repurchase program that we expect will be completed by year-end. At quarter end, we had around $725 million in cash while debt was $5.4 billion. Our leverage was 2.7 times gross debt to trailing 12 months adjusted EBITDA.
Now I'll review our segment performance, beginning with Diagnostics Laboratories. Revenue for the quarter was $2.3 billion, an increase of 6.2% compared to last year, driven primarily by organic growth of 3.4% and acquisitions of 3%. The base business grew organically by 12.8% compared to the base business last year, while COVID testing revenue was down 87%. The Ascension lab management agreement contributed approximately 6% of the growth. Total volume increased 2.3% compared to last year as acquisition volume grew 3.4%, primarily offset by organic volume of minus 1.1% due to COVID testing.
Base business volume grew 7.2% compared to the base business last year as organic increased 3.6% for volume, while acquisitions also contributed 3.6%. Price/mix increased 3.9% versus last year, primarily due to an organic base business increase partially offset by lower COVID testing. Base business organic price/mix was up 9.2% compared to base business last year, benefiting from the Ascension lab management agreement of approximately 6%. Diagnostics Laboratories adjusted operating income for the quarter was $386 million, or 16.5% of revenue compared to $440 million or 19.9% last year. The decrease in adjusted operating income was due to a reduction in COVID-19 testing, while the margin was also affected by the mix impact from Ascension.
Base business margin, excluding the mix impact of Ascension was up approximately 30 basis points as the benefit of organic growth and LaunchPad savings were partially offset by higher personnel expense. Now I'll review our segment performance of Biopharma laboratory services. Revenue for the quarter was $719 million, an increase of 7.9% compared to last year, primarily due to an increase in organic revenue of 4.9% and foreign currency of 3.3%. The 7.9% revenue growth was driven by continued strength in Central Labs, which was up 9%, while early development was up 5.7%.
While early development is no longer constrained by NHP availability, it has experienced higher than normal cancellations and lower orders primarily due to small biotech funding. Biopharma Laboratory Services adjusted operating income for the quarter was $109 million or 15.2% of revenue compared to $105 million or 15.8% last year. The decrease in adjusted operating margin was due to stranded costs as a result of the spin of Fortia, which is timing related. Excluding stranded costs, margins were up in the third quarter, as the benefit of top line growth and LaunchPad savings were partially offset by higher personnel costs. We expect margins in the fourth quarter to be up sequentially and year-over-year.
We ended the quarter with a backlog of $7.8 billion, and we expect approximately $2.4 billion of this backlog to convert into revenue over the next 12 months. Trailing 12 months book-to-bill was 1.12. Now I'll discuss our 2023 full year guidance, which assumes foreign exchange rates effective as of September 30, 2023, for the remainder of the year. The enterprise guidance also includes the impact from currently anticipated capital allocation, with free cash flow targeted for acquisitions, share repurchases and dividends. In addition, the guidance includes the impact from the $1 billion accelerated share repurchase program, which was funded with proceeds from the spin.
With regard to our 2023 full year guidance, we've narrowed the ranges but have maintained the same midpoint from our prior guidance for enterprise revenue, earnings and cash flow. We expect Enterprise revenue to grow 1.9% to 2.7% compared to 2022. This increase reflects the base business growing 11.5% to 12.2%, while COVID testing is expected to decline 85% to 86%. We expect Diagnostics Laboratories revenue to be up 1.5% to 2% compared to 2022. This guidance includes the expectation that the base business will grow 14.1% to 14.6%, which includes approximately 5% growth from Ascension. The base business has improved from our prior guidance as acquisition-related revenue that was forecasted at the enterprise level is now reflected in the segment as we've closed those transactions.
We continue to expect Diagnostics Laboratories based business margin to be up slightly in 2023 versus 2022, including the unfavorable mix impact from Ascension. We expect Biopharma laboratory services revenue to grow 3.1% to 4% compared to 2022. Excluding the change in currency translation of negative 20 basis points, the midpoint of the guidance range remains unchanged from our prior guidance. We expect the revenue growth rate to continue to improve in the fourth quarter. In addition, we expect margins for the full year to be flat to slightly up, while the fourth quarter is expected to see both sequential and year-over-year improvement. Our guidance range for adjusted EPS is $13.25 to $13.75, unchanged at the midpoint from our prior guidance.
Free cash flow from continuing operations, excluding spin-related items, is expected to be between $850 million to $950 million, also unchanged from our prior guidance at the midpoint. In summary, we expect to drive continued profitable growth in our base business. We expect to continue to use our free cash flow generation for acquisitions that supplement our organic growth, while also returning capital to shareholders through our share repurchase program and dividends.
Operator, we will now take questions.