One embryo at a time
US practice already changed. The reason is in the outcome data.
Between 2013 and 2022, US clinics went from transferring a single embryo in 30.8% of transfers to 85.9%. Over the same period:
| Share of all ART-conceived infants | 2013 | 2022 |
|---|---|---|
| Single babies | 60.1% | 91.4% |
| Twins | 38.1% | 8.4% |
| Triplets or more | 1.8% | 0.2% |
That is one of the largest and fastest safety improvements in modern reproductive medicine, and it happened by transferring fewer embryos rather than by any new technology.
The trade is real and should be stated: transferring one embryo lowers your chance of a pregnancy from that transfer. The remaining embryos are frozen for later transfers, which is why clinics quote a cumulative figure rather than a per-transfer one. What transferring one embryo removes is the twin pregnancy, along with its 63% chance of preterm birth.
If you are paying out of pocket, notice the pressure you are underAn analysis of 134,997 US IVF cycles found that in states with comprehensive insurance mandates, the mean number of embryos per transfer was lower (1.30 against 1.36), the multiple birth rate was lower (10.2% against 13.8%), and the live birth rate per cycle was higher (35.4% against 33.4%).
An earlier analysis of 1998 data found the reverse on live birth, with higher per-cycle success in no-coverage states alongside more triplet pregnancies. And a registry study titled
What is consistent across twenty years is the direction on multiples. Paying per attempt creates pressure to load each attempt. That pressure is yours and your clinic's, and it is worth naming out loud in the room.
An earlier analysis of 1998 data found the reverse on live birth, with higher per-cycle success in no-coverage states alongside more triplet pregnancies. And a registry study titled
Insurance mandates, embryo transfer, outcomes: the link is tenuouscautions that the relationship varies by age group. This guide includes that dissent rather than telling you a tidier story.
What is consistent across twenty years is the direction on multiples. Paying per attempt creates pressure to load each attempt. That pressure is yours and your clinic's, and it is worth naming out loud in the room.
Where this comes from:
43. Centers for Disease Control and Prevention. National ART summary. Atlanta: US Department of Health and Human Services; page last reviewed December 10, 2024.
62. Sunderam S, Kissin DM, Zhang Y, Jewett A, Boulet SL, Warner L, et al. Assisted reproductive technology surveillance: United States, 2018. MMWR Surveill Summ. 2022;71(4):1-19.
120. Peipert BJ, Chung EH, Harris BS, Jain T. Impact of comprehensive state insurance mandates on in vitro fertilization utilization, embryo transfer practices, and outcomes in the United States. Am J Obstet Gynecol. 2022;227(1):64.e1-64.e8.
121. Jain T, Harlow BL, Hornstein MD. Insurance coverage and outcomes of in vitro fertilization. N Engl J Med. 2002;347(9):661-666.
122. Banks NK, Norian JM, Bundorf MK, Henne MB. Insurance mandates, embryo transfer, outcomes: the link is tenuous. Fertil Steril. 2010;94(7):2776-2779.
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This page is educational. It supports the conversation with your own clinicians. It is not consent to any treatment, and it cannot assess you. If you are worried about a symptom now, see urgent warning signs.