Understanding IVF success rates without the marketing spin

A positive pregnancy test, a clinical pregnancy and a live birth are different outcomes. For most people planning treatment, a live-birth measure is more useful than a pregnancy-test rate.

A rate per embryo transfer counts only people who reached transfer. A rate per intended egg retrieval also accounts for cycles where no embryo became available. Cumulative reporting may include multiple transfers from one retrieval. These figures answer different questions and should not be compared as if they were interchangeable.

Age at egg retrieval, use of donor eggs, diagnosis and previous treatment all influence results. A clinic treating more complex cases can have a lower headline rate without providing poorer care. Donor-egg outcomes should not be compared with outcomes using a patient’s own eggs.

Registry reports also lag behind current practice. Check the reporting year, patient group and number of cycles. Small groups produce less stable estimates.

A national average is not a prediction for you. Ask your clinician how your history changes the estimate and what uncertainty remains. Consider communication, travel, scheduling and laboratory experience alongside outcome data.