Stephen Williamson
Senior Vice President and Chief Financial Officer at Thermo Fisher Scientific
Thanks, Marc and good morning, everyone. As you saw in our press release we executed really well in Q4. Market conditions played out largely as we had expected in the quarter, and through the great execution, we delivered 1% more core organic revenue growth than our prior guide. In terms of adjusted EPS, we beat our prior guide by $0.05 and that included offsetting $0.08 of additional FX headwind, so really strong operational execution in the quarter.
We also capped off the year with very strong free cash flow delivering $7 billion in 2023. Throughout the year we navigated the changing macro environment very effectively. Our proven growth strategy and PPI business system enabled us to deliver a differentiated experience for our customers and differentiated financial results for our shareholders, all the while continuing to invest in the business and advance our strategic position as the world leader in serving science.
Let me now provide you some additional details in our performance. Beginning with our earnings results, we delivered $5.67 of adjusted EPS in Q4 and $21.55 for the full year. GAAP EPS in the quarter was $4.20 and $15.45 for the full year. On the top line, reported revenue was 5% lower year-over-year in Q4. The components of our Q4 reported revenue change included 7% lower organic revenue, a 1% contribution from acquisitions, and a tail end of 1% from foreign exchange. Q4 core organic revenue decreased 4%.
For the full year 2023 reported and organic revenue decreased 5% and core organic revenue growth for the year was 1%. In 2023, we delivered $1.73 billion of pandemic related revenue, $330 million of testing and $1.4 billion of vaccines and therapies revenue. Turning to our organic revenue performance by geography, the organic growth rates by region are skewed by the pandemic-related revenue in the quarter -- in the current year and prior year.
In Q4, North America declined low double digits, Europe declined low single digits, Asia Pacific grew low single digits with China declining in the mid-single digits. For the full year, North America declined high single digits, Europe declined low single digits, and Asia-Pacific declined low single digits with China declining high single digits.
With respect to our operational performance, we delivered $2.55 billion of adjusted operating income in the quarter, and adjusted operating margin was 23.4%, 100 basis points higher than Q4 last year. In the quarter, we continued to deliver exceptionally strong productivity and achieved good price realization this is partially offset by lower pandemic-related revenue, strategic investments, and FX. The strength of our productivity reflects the impact of our PPI business system.
It's enabling us to manage our cost base appropriately given the macro conditions. For the full year, adjusted operating income decreased 11% and adjusted operating margin was 22.9% in line with our prior guide. Total company adjusted gross margin in the quarter came in at 41.5%, 10 basis points higher than Q4 last year. The change in gross margin was due to the same drivers as those of our adjusted operating margin. For the full year, adjusted gross margin was 41.2%.
Moving on to the details of the P&L, adjusted SG&A in the quarter was 15.1% of revenue, an improvement of 50 basis points over Q4 last year. For the full year, adjusted SG&A was 15.2% of revenue, an improvement of 60 basis points compared to 2022. Total R&D expense was $328 million in Q4. For the full year, R&D expense was $1.35 billion, reflecting our ongoing investments in high-impact innovation. R&D as a percent of our manufacturing revenue was 6.8% in 2023.
Looking at our results below the line, our Q4 net interest expense was $81 million, which is $38 million lower than Q4 2022. Net interest expense for the full year was $495 million, an increase of $41 million year-over-year. Adjusted other income and expense was a net expense in the quarter of $19 million, $9 million higher than Q4 2022. This is primarily due to changes in non-operating FX. For the full year, adjusted other income and expense was a net expense of $16 million compared to a net income of $14 million in 2022.
Our adjusted tax rate in the quarter and for the full year was 10%. This was 280 basis points lower than Q4 last year and 300 basis points lower for the full year, reflecting the results of our tax planning activities. Average diluted shares were 388 million in Q4, approximately 5 million lower year-over-year driven by share repurchases net of options. And shortly after the year-end in January 2024, we repurchased $3 billion of shares.
Turning to cash flow and the balance sheet, full year cash flow from operations was $8.4 billion and as I mentioned earlier, free cash flow was $7 billion after investing $1.4 billion of net capital expenditures. We returned $136 million of capital to shareholders through dividends in Q4 and $523 million for the full year. During the year, we invested $3.7 billion on completed acquisitions and committed $3.1 billion to the acquisition of Olink, which we expect to close by mid-2024.
We ended the quarter with $8.1 billion in cash and $34.9 billion of total debt. Our leverage ratio at the end of the quarter was 3.2 times gross debt to adjusted EBITDA and 2.5 times on a net debt basis. Concluding my comments on our total company performance, adjusted ROIC was 12%, reflecting the strong return on investment that we're generating across the company.
Now provide some color on the performance of our four business segments. Let me start with a couple of framing comments. The scale and margin profile of our pandemic-related revenue varies by segment, and that revenue was higher in the prior year so that does skew some of the reported segment growth rates and margins. In 2023, we continue to execute strong pricing realization across all segments to address inflation.
Moving on to the segment details, starting with Life Sciences Solutions, Q4 reported revenue in this segment declined 19%, and organic revenue was 20% lower than the prior year quarter. This was driven by the runoff of our pandemic-related revenue in this segment as well as lower levels of activity in our bioproduction business versus the year ago quarter. For the full year, reported and organic revenue was 26% lower than 2022. Q4 adjusted operating income for Life Science Solutions decreased 14% and adjusted operating margin was 36.2%, up 210 basis points versus the prior year quarter.
During the quarter, we delivered exceptionally strong productivity, which was partially offset by unfavorable volume pull-through. The team has done an excellent job of appropriately managing the cost base and dealing with the unwind of the pandemic. For the full year, adjusted operating income declined 39% and adjusted operating margin was 34.3%.
In the Analytical Instruments segments, reported revenue increased 8% in Q4 and organic growth was also 8%. The strong growth in this segment this quarter was led by the electron microscopy business. For the full year, both reported and organic revenue were 10% higher than 2022. In this segment, Q4 adjusted operating income increased 23% and adjusted operating margin was 28.8%, up 340 basis points year-over-year. In the quarter, we delivered strong productivity and volume pull-through, which is partially offset by FX and strategic investments. For the full year, adjusted operating income increased 27% and adjusted operating margin was 26.3%, an increase of 350 basis points versus the prior year.
Turning to Specialty Diagnostics, in Q4, reported revenue declined 1% and organic revenue was 7% lower than the prior year quarter. In Q4, we continued to see strong underlying growth in the core led by transplant diagnostics, microbiology and immunodiagnostics businesses. This was offset by lower pandemic-related revenue versus the year ago quarter. For the full year, reported revenue declined 8% and organic revenue was down 13%.
Q4 adjusted operating income for Specialty Diagnostics increased 27% in the quarter and adjusted operating margin was 23.9%, which is 530 basis points higher than Q4 of 2022. In Q4, we delivered strong productivity and favorable business mix, which was partially offset by the lower -- the impact of lower COVID-19 testing volume and strategic investments. For the full year, adjusted operating income was 10% higher than 2022 and adjusted operating margin was 25.5%, an increase of 400 basis points versus 2022.
Finally, in the Laboratory Products and Biopharma Services segment, Q4 reported revenue decreased 4% and organic revenue was 5% lower than the prior year quarter. This was driven by the runoff of vaccines and therapies revenue and the phasing of revenue in our Pharma Services business within 2023 as had been expected. For the full year, both reported and organic revenue were 2% higher than 2022. In this segment, Q4 adjusted operating income declined 4% and adjusted operating margin was 14%, which is 10 basis points lower than Q4 2022. In the quarter, we delivered strong productivity, which is more than offset by unfavorable volume mix. For the full year, adjusted operating income was 17% higher than the prior year and adjusted operating margin was 14.6%, an increase of 180 basis points versus 2022.
Let me now turn to guidance, and as Marc outlined, we're initiating a 2024 revenue guidance range of $42.1 billion to $43.3 billion and adjusted EPS guidance range of $20.95 to $22. Our guidance assumes core organic revenue growth in the range of minus 1% to positive 1% for 2024. Our view on the expected market conditions in 2024 has not changed significantly from our initial framing for the year shared on the last earnings call. We're assuming that the market declines in the low single digits this year, our growth strategy and PPI Business System execution will enable us to continue to take share once again this year.
Our current estimate of pandemic-related revenue in 2024 is just under $100 million of testing revenue and $300 million to $400 million of vaccines and therapies-related revenue. In total, this represents a year-over-year headwind of $1.3 billion to $1.4 billion or 3% of revenue. M&A is expected to increase revenue by $175 million year-over-year, the combination of six months of Olink revenue and the inorganic portion of CorEvitas revenue in 2024. At current rates, we expect FX to be neutral year-over-year to both revenue and adjusted EPS. From a phasing standpoint, FX is expected to be a slight headwind in Q1 and an offsetting tailwind in the second half.
Turning to margins, our 2024 guidance range assumes adjusted operating income margins between 22.3% and 22.8%. We continue to aggressively manage our cost base, and that's reflected in this margin outlook. In terms of the range for the margins, that's driven by the revenue range that I provided. We'll continue to use the PPI Business System to not only manage costs very carefully, but also continue to make the right long-term investments to enable us to further advance our industry leadership. Strong underlying productivity and cost controls, including the carryover benefit from the cost actions put in place last year, are expected to largely offset the runoff in the remaining pandemic-related revenue inflation and a normalization of incentive compensation across the company to appropriately invest in our colleagues.
Below the line, we expect approximately $430 million of net interest expense in 2024 and expect adjusted other income and expense to net close to zero. We assume that adjusted income tax rate will be 10.5% in 2024 and below the taxline you should factor in $20 million of profit elimination related to minority interests. We're expecting between $1.3 billion and $1.5 billion of net capital expenditures in 2024, and we're assuming free cash flow is in the range of $6.5 billion and $7 billion for the year.
In terms of capital deployment, our guidance assumes $3 billion of share buybacks, which, as I mentioned earlier, were already completed in January and we estimate the full year average diluted share count will be approximately 383 million shares. We're assuming that we'll return approximately $600 million of capital to shareholders this year through dividends, and we're assuming that we closed the acquisition of Olink by midyear.
And finally, I wanted to touch on quarterly phasing for the year as there are a few things to consider. First, in terms of organic revenue growth we expect Q1 to be better sequentially than Q4 2023 by 1 to 2 points and then improve each quarter during the year. Implied in that is core organic revenue growth in Q1 similar to Q4 2023. And core organic revenue growth is also expected to improve each quarter during the year, leading to moderate growth in the second half of the year. From a margin standpoint, we expect Q1 to be just under 21% and increase each quarter throughout the year from that level. And we expect Q1 adjusted earnings per share to be approximately 22% of the full year.
So in conclusion, we navigated the challenging environment in 2023 very successfully. We stepped up for our customers and delivered differentiated financial performance for our shareholders. We continue to manage the company with agility, and we're really well positioned for the year ahead. I look forward to updating you on our progress as we go through the year.
With that, I'll turn the call back over to Raf.