Karleen Oberton
Chief Financial Officer at Hologic
Thank you, Essex, and good afternoon, everyone.
In my statements today, I will provide an overview of our revenue results, walk down our income statement showcasing strong performance, touch on a few other key financial metrics and finish with our guidance for the third quarter and full fiscal 2024. As highlighted, our second quarter financial results were very strong, exceeding our expectations on revenue and profitability. Q2 was a continuation of our momentum from Q1. Total revenue came in at $1.018 billion, beating the midpoint of our guidance by $18 million. We delivered organic growth of 4.9%, excluding COVID, on top of a challenging double-digit comp from the prior year.
In addition, non-GAAP earnings per share was $1.03, which exceeded the high end of our guidance by $0.03. Before moving on to our franchise results, we want to highlight the continued strength of our balance sheet. In Q2, we generated over $290 million in cash from operating activities and ended the quarter with nearly $2.2 billion on the balance sheet. Our strong cash balance leverage ratio well below our target range and ability to consistently generate strong cash flow provide us the flexibility to fund innovation and execute our capital allocation strategy. We have significant firepower to continue to deploy capital as opportunities arise.
Turning to our franchise results. In Diagnostics, second quarter revenue of $450.1 million declined 3.2%. Excluding COVID assay and related revenue, worldwide Diagnostics grew by 9.8%. Within Diagnostics, Molecular Diagnostics continues to contribute significantly, growing 10.7% excluding COVID. We continue to see underlying strength in BV/CV/TV, which continues its outstanding growth trajectory. BV/CV/TV is tracking to become our second largest assay globally. With very little international revenue as we have focused primarily on the US market. Additionally, as expected, non-COVID respiratory assay sales remained solid as the flu season continued into our second quarter.
Growth was a combination of more volume year-over-year across our respiratory menu plus ASP lift from elevated contribution from our COVID, Flu A, Flu B and RSV 4-Plex assay. Finally, Biotheranostics remains a strong pillar of growth for our base molecular business. Rounding out Diagnostics, Psychology and perinatal grew 7.9% globally, primarily fueled by double-digit growth internationally as well as impact from the prior year comp. As a reminder, Q2 last year was adversely impacted by supply constraint issues related to a third-party logistics partner. Level set growth in the second quarter is above our long-term expectations for this business.
Moving on to Breast Health. Total second quarter revenue of $384.6 million decreased 0.3%, but grew 1% when excluding SSI. As a reminder, Q1 '24 resulted in an elevated growth rate assisted by lapping soft prior year performance due to supply constraints in Q1 '23. The opposite is true for Q2 '24, where we faced significant prior year comps. In Q2 of last year, we placed an elevated number of gantries as semiconductor chip supply and visibility improved. For the remainder of the year, we expect growth rates in the gantry business to normalize.
Within Breast Health, growth was driven primarily by our international interventional mix. This highlights the diversity of growth drivers Steve and Essex commented on. And the fact that growth drivers across our business and within our divisions can change and morph over time. Continuing next to Surgical. Second quarter revenue of $156 million increased 7.4%. Surgical growth continues to be fueled by MyoSure in the related Fluent fluid management system. As anticipated, NovaSure continues to be a headwind to growth as we lapped the prior year NovaSure V5 ASP lift. And finally, in our Skeletal business, Second quarter revenue of $27.1 million declined 14.3% from lower capital placements and upgrades.
Now let's move on to the rest of the non-GAAP P&L for the second quarter. Gross margin was 60.7% for the quarter and in line with expectations. The decline of 160 basis points from the prior year was anticipated and primarily driven by lower COVID sales compared to the prior year period. As a reminder, we expect gross margin to improve as we work past the amortization of previously procured higher-priced semiconductor chips. Total operating expense of $307.6 million in the second quarter decreased by 3%. This decrease was primarily driven by elimination of expenses related to the divested SSI business.
As Steve mentioned, the operating margin was 30.4% for the second quarter. The year-over-year decline of 90 basis points was driven primarily from lower COVID sales. Sequentially, as expected, operating margins expanded 190 basis points from Q1 largely from lower operating expenses in Q2, a strong result for the quarter. Below operating income, other income net represented a loss of nearly $6 million in our first -- in our fiscal second quarter. As expected, interest income is lower due to lower cash balances from the significant share repurchases completed earlier in the fiscal year. Additionally, interest expense is up due to lower proceeds from our interest rate swaps. Finally, our tax rate in Q2 was 19.75% as expected.
Now let's move on to our non-GAAP financial guidance for the third quarter and full year fiscal 2024. For Q3 2024, we are expecting total revenue in the range of $992.5 million to $1007.5 million and EPS of $0.98 to $1.05. For the full year 2024, our guidance assumes revenue of $4 billion to $4.05 billion and EPS of $4.02 to $4.12. With respect to foreign exchange, we expect the recent strengthening of the US dollar to create a significant headwind in the second half of the year. For Q3, we are assuming FX headwind of about $3 million. For the full year, we now expect a slight tailwind of about $2 million. All in, this represents about a $2 million -- a $10 million impact to our prior guidance. And as a reminder, prior guidance assumed a $12 million tailwind for the full year.
Turning to our franchises. We want to reiterate that we expect each to grow at least 5% to 7% in our fiscal 2024, excluding the impact of COVID. While we have navigated the most challenging comps from fiscal '23, we still have strong double-digit comps across the board to close out fiscal '24. Starting with Diagnostics. We expect our Molecular Diagnostics business to drive high single-digit growth, excluding COVID as customers continue to adopt and drive utilization of our expanded menu. In cytology and perinatal, however, we expect minimal growth in Q3.
In Q3 of last year, customers built inventory as a result of the third-party shipping constraints experienced in Q2 of '23, resulting in slightly elevated sales. We expect to see more normalized comps for our cytology and perinatal business in fiscal year '25. Closing out on non-COVID diagnostics, we expect blood revenue of approximately $7 million in Q3 and $28 million for the full year. In terms of COVID revenue, we expect COVID assay sales to be about $5 million to $10 million in Q3 '24 and about $60 million to $65 million for the full year. COVID-related items are expected to be about $25 million in the third quarter and approximately $105 million for the full year.
Moving on to Breast Health. We remain on pace to grow the business within the 5% to 7% range for the year. As a reminder, we closed out fiscal '23 with 3 straight quarters of 25% plus growth rates. We expect steady performance in Breast Health in the back half of the year as the business continues to improve sequentially. The demand for our portfolio of products and service remains strong, and we continue to have excellent visibility into gantry orders. Further, our confidence in delivering more gantries than last year remains high. We continue to successfully manage resource availability among both our install teams and our customers, as customers balance the need to meet elevated demand for screening and staffing constraints. Finally, in Surgical, we anticipate our full year fiscal 2024 revenue growth to be at the high end of our 5% to 7% long-term target. The growth will continue to come from MyoSure Fluent as well as both Accesa and Bolder.
Moving next to margins. We reiterate that our guidance assumes the cadence of improvement throughout fiscal '24 for both gross margin and operating margin. For gross margin, we anticipate Q3 will improve sequentially from Q2 as we continue to work through our higher cost chips in Breast Health. Remain on pace to exit the fiscal year in the low 60s. Our guidance also assumes Q3 operating margins in the low 30s, and we remain on pace to finish fiscal '24, approaching 31%. Below operating income, we estimate fiscal '24 other income net to be an expense of approximately $10 million in Q3 and an expense between $30 million and $40 million for the full year.
Our guidance is based on an annual effective tax rate of approximately 19.75%, and diluted shares outstanding are expected to be approximately $238 million for the full year.
To conclude, Q2 was another strong quarter and sets us up nicely for the second half of the year. As always, we remain focused on advancing women's health around the world while delivering on our promises and commitments to our shareholders, employees, customers and patients.
With that, we ask the operator to open the call for questions.