IVF Success Rates

What do the numbers mean?

We calculate IVF statistics in several ways. Each statistic provides a different insight into treatment outcomes and expectations.

We believe that providing the most accurate assessment of the outcome of IVF, including good and bad outcomes help people make good choices. The more accurately we can predict the outcome of IVF treatment, the better and more informed the decision making process.

Statistics using Started Cycles are helpful for patients before they begin a cycle because these statistics include everyone who gets cancelled or does not have a transfer. Thus, these statistics reflect the outcome of everyone who starts treatment, which some argue are the most helpful to patients because they include everyone who starts and not just the patients with a high probability of success.

Feb 2013 – Sep 2014 IVF Outcomes

newest data available

Combined Prognosis<35 35-37 38-40 41-42 Totals Donor Egg
Number of Cycles8843301717818
Ongoing Pregnancy/ET66%56/8564%23/3667%16/2425%4/1662%72%13/18
Elective Single Embryo Transfer-E54%33%13%6%40%56%
Average Number Transferred1.
Multiple Gestation24%18%33%0%2%67%


*Statistics using only Cycles with an Embryo Transfer inform patients who expect a good prognosis for IVF embryo transfer.

P – Positive Pregnancy Test per Cycle Start: The percentage of started IVF cycles with a positive pregnancy test.

O – Ongoing Pregnancies.

I – Implantation Rate.

Q – Sustained Clinical Pregnancy/Transfer The percentage of embryo transfers with an ultrasound-proven embryonic heart rate that did not miscarry. This percentage should be very close to the delivery rate that we report to SART and the CDC.

W – Implantation Rate: The percentage of embryos transferred that resulted in an ongoing pregnancy. We calculate this number by dividing the number of ongoing pregnancies by the number of embryos transferred. The implantation rate is a very good way to determine the embryo quality from the IVF lab.

E – Elective Single Embryo Transfer: The percentage of patients who chose to transfer a single embryo when they had multiple embryos available for transfer. We use this statistic to gauge how aggressively the clinic tries to avoid multiple gestations. Clinics with high implantation rates can perform more eSET and maintain a high pregnancy and delivery rate.

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