Glenn Eisenberg
Executive Vice President and Chief Financial Officer at Laboratory Co. of America
Thank you, Adam. I am going to start my comments with a review of our fourth quarter results, followed by a discussion of our performance in each segment and conclude with our 2023 full-year guidance. For reference, we have also included additional business information that can be found in our supplemental deck on our Investor Relations website. Revenue for the quarter was $3.7 billion, a decrease of 9.4% compared to last year due to lower COVID testing and the negative impact from foreign currency. This was partially offset by organic base business growth and the impact from acquisitions. COVID testing revenue was down 79% compared to COVID testing last year, while the base business grew 4.8% compared to the base business last year. Organically and constant-currency, the base business grew 4.7% benefiting from the Ascension lab management agreement, which contributed approximately 4% of the organic growth.
While the outreach business that we acquired from Ascension is treated as an acquisition. The lab management agreement is treated as organic growth. Operating income for the quarter was $91 million or 2.5% of revenue. During the quarter, we had $61 million of amortization and $88 million of restructuring charges and special items, primarily related to acquisitions, LaunchPad initiatives and the proposed spin-off Fortrea. In addition, the company recorded $270 million of goodwill and other asset impairment, primarily related to the early development business due to short-term labor and supply constraints. This impairment represents approximately 2% of LabCorp's goodwill and intangible assets.
Excluding these items, adjusted operating income in the quarter was $510 million or 13.9% of revenue compared to $902 million or 22.2% last year. The decrease in adjusted operating income and margin was due to a reduction in COVID testing. The benefit from LaunchPad savings and lower personnel expense were essentially offset by lower COVID related demand and inflationary costs. Our LaunchPad initiative continues to be on-track to deliver $350 million of savings over the three-year period ending in 2024. The adjusted tax-rate for the quarter was 20% compared to 24.6% last year. The lower adjusted tax-rate was primarily due to the geographic mix of earnings as well as the benefit from increased R&D tax credits and year end true-ups for completed tax returns. We expect our 2023 full-year adjusted tax-rate to be approximately 24%.
Net earnings for the quarter were $76 million or $0.86 per diluted share, adjusted EPS was $4.14 in the quarter, down from $6.77 last year due to lower COVID testing earnings. Operating cash-flow was $654 million in the quarter compared to $698 million a year-ago. The decrease in operating cash-flow was due to lower COVID test earnings partially offset by higher base business earnings. Capital expenditures totaled $118 million, down from $150 million last year. For the year, capital expenditures were 3.5% of base business revenue and we expect that to continue into 2023. Free-cash flow-in the quarter was $536 million, bringing our full-year free-cash flow generation to $1.5 billion.
During the quarter, we invested $150 million on acquisitions, paid out $64 million in dividends and repurchased 300 million of stock representing approximately 1.4 million shares. At the end-of-the quarter, we had $532 million of share repurchase authorization remaining. The Board recently approved an additional $1 billion for share repurchases, taking our total available authorization to approximately $1.5 billion. For the full-year, we invested $1.2 billion on acquisitions, paid out $195 million in dividends and repurchased $1.1 billion of stock. We continue to have a robust pipeline of potential acquisition opportunities that will supplement our organic growth. In addition, we continue to believe that our shares are undervalued and that our share repurchase program is an important part of our capital allocation strategy. At year end we had $430 million in cash, while debt was $5.3 billion. Our leverage was 1.9x gross debt to trailing 12-months EBITDA. Excluding COVID testing earnings, our leverage was around 2.5x, in-line with our targeted range of 2.5x to 3x.
Now, I will review our segment performance beginning with Diagnostics. Revenue for the quarter was $2.3 billion, a decrease of 12.8% compared to last year. Primarily due to organic revenue being down 14.3%, which was due to COVID testing. Partially offset by acquisitions of 1.7%. COVID testing revenue was down 79% compared to COVID testing last year. While the base business grew organically by 8.6% compared to the base business last year. The essential lab management agreement contributed approximately 7% of the growth. While the negative impact of weather and fewer revenue days constrained growth by approximately 1.2%. Relative to the fourth-quarter of 2019, the compound annual growth rate for base business revenue was 6.9%.
Total volume decreased 11.8% compared to last year as organic volume decreased by 13.8% primarily offset by acquisition volume of 2%. The decline in volume was due to COVID testing, base business volume grew 3% compared to base business last year, including the benefits from acquisitions of 2.4% but was constrained by unfavorable impact from weather and fewer revenue days of approximately 1.2%. Price-mix decreased 1% versus last year due to lower COVID testing of 6.4%, currency of 0.3% and acquisitions of 0.2%, partially offset by base business growth of 5.9%. Base business price-mix was up 7.6% compared to base business last year, benefiting from the Ascension lab management agreement of approximately 7%.
Diagnostics adjusted operating income for the quarter was $387 million or 16.9% of revenue compared to $776 million or 29.6% last year. The decrease in adjusted operating income and margin was due to a reduction in COVID testing as the COVID margin was approximately 50% for the quarter, down from approximately 70% last year. We expect the COVID margin to be approximately 50% through the duration of the public health emergency, at which point we would expect the margin to decline, but still be above the segment average. Base business margin was down approximately 30 basis-points due to the impact from Ascension, higher personnel expense and other inflationary costs, partially offset by organic growth and LaunchPad savings. Excluding Ascension, margin would have been up approximately 50 basis-points.
Now, I will review the performance of Drug Development. Revenue for the quarter was $1.4 billion, a decrease of 4.1% compared to last year, primarily due to foreign currency of 3.1%. Organic base business revenues declined 1.4% compared to last year due to the negative impact from lower COVID related work and Ukraine-Russia crisis. Excluding these impacts, organic base business revenue grew 3.7%. The Central Lab business continued to be the most constrained by these impacts. Central lab base business revenues were down 11.5%, however excluding these impacts organic constant-currency revenue was up 4.7%. While on a comparable basis, early development was up 3.4% and clinical development was up 3.2%.
Reported fourth quarter Drug Development revenues on a compound annual basis grew 5.1% compared to the fourth quarter of 2019. Adjusted operating income for the segment was $209 million or 15% of revenue compared to $206 million or 14.2% last year. The increase in adjusted operating income and margin was due to LaunchPad's savings and lower personnel costs, partially offset by lower COVID related demand, the Ukraine-Russia crisis and inflationary costs. We ended the quarter with backlog of $16.3 billion and we expect approximately $4.9 billion of this backlog to convert into revenue over the next 12-months.
Now, I will discuss our 2023 full-year guidance, which assumes foreign-exchange rates effective as of December 31, 2022 for the full-year. The enterprise guidance also includes the impact from currently anticipated capital allocation with free-cash flow targeted for acquisitions, share repurchases and dividends. Also, our guidance assumes that Fortrea will be part of LabCorp for the full-year. Upon its spin currently anticipated in the middle of the year, we expect to provide updated guidance.
We expect Enterprise revenue to grow 1% to 4% compared to 2022. This guidance includes the expectation that the base business will grow 8.5% to 10.5% while COVID testing is expected to decline 75% to 90%. This assumes a PCR volume range of 5,000 to 12,000 tests per day on average for the year. We expect Diagnostics revenue to be down 2% to up 1.5% compared to 2022. This guidance includes the expectation that the base business will grow 10.5% to 12.5% which adds approximately 5% growth due to Ascension. At the midpoint of our base business guidance, the compound annual growth rate compared to 2019 is 6.4% including the benefits from Ascension of approximately 2%.
We expect Diagnostics base business margin to be slightly up in 2023 versus 2022, including the unfavorable mix impact from Ascension. We expect Drug Development revenue to grow 5% to 7% compared to 2022, this guidance includes the positive impact from foreign currency of 20 basis-points. At the midpoint of our guidance, the compound annual growth rate compared to 2019 is 7.2%, primarily due to organic growth. While we have increased the number of NHP vendors with multi-year agreements to secure supply, lead times are projected to negatively impact Drug Development revenue between $80 million to a $100 million early in the year. As a result, we expect Drug Development first-quarter revenue growth to be lower than the average for the year. We also expect drug development margin to increase in 2023 compared to 2022 with the first-quarter coming in comparable to the first-quarter of 2022 due to the early development supply constraints.
Our guidance range for adjusted EPS is $16 to $18 compared to $19.94 in 2022. Adjusted EPS is expected to be lower compared to 2022 due to COVID testing while base business adjusted EPS at the midpoint of guidance implies approximately 13% growth. Free-cash flow guidance is $1 billion $1.2 billion compared to $1.5 billion in 2022. The decline in cash-flow was due to lower COVID testing. In summary, we expect to drive continued profitable growth in our base business, while COVID testing volumes are expected to continue to decline through the year. 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.