The use of preimplantation genetic tests (PGT) in in vitro fertilization cycles, including tests for nonmedical sex selection, increased significantly in states without mandated insurance coverage, based on data from a study of 300,000 IVF cycles.
Previous studies have shown associations between IVF insurance coverage and various IVF practice patterns, but trends in genetic testing according to state-mandated insurance have not been explored, Bronwyn S. Bedrick, MD, of Johns Hopkins University, Baltimore, and colleagues wrote.
“Preimplantation genetic testing was introduced into clinical practice to prevent transmission of genetic disease and to improve uptake of single embryo transfer, but in the real world there are many potential applications,” corresponding author Emily Jungheim, MD, of Northwestern University, Chicago, said in an interview. “We wanted to know how PGT is being applied given that its use is on the rise.”
In a study published in Obstetrics & Gynecology, the researchers analyzed genetic testing in deidentified autologous, nonbanking IVF cycles from 2014 to 2016 obtained through the Society for Assisted Reproductive Technology Clinic Outcome Reporting System (SART CORS). The data set included 301,465 IVF cycles and 224,235 unique patients over the 3-year study period. Of these, 78,578 cycles (26%) used PGT, and overall, the proportion of IVF cycles using PGT approximately doubled, from 17% in 2014 to 34% in 2016 – a significant increase over time (risk ratio, 1.37). As of 2021, 13 states had mandates that health insurance include IVF costs.
In states with insurance mandates versus nonmandated states, the proportion of any PGT was 28.8% vs. 19.6%, and the probability was 32% lower in states with mandates (RR. 0.68; P < .001).
Aneuploidy was the most common indication for PGT, and accounted for 60% of the cycles; however, the number of cycles using PGT for elective sex selection increased from 1,314 cycles in 2014 to 2,184 in 2016 (approximately 66% increase).
In a multivariate analysis, IVF cycles for elective sex selection was 56% lower in states with mandates, compared with those without (RR, 0.44; P < .001).
In addition, cycles involving nonmedical sex selection were significantly more likely to result in male offspring, the researchers said.
“The increase in the number of cycles using elective sex selection seen in this study may reflect the growing number of clinics offering [PGT] for nonmedical sex selection as well as increasing public awareness of preimplantation genetic testing,” the researchers wrote.
However, the socioeconomic characteristics of women may play a role in the use of PGT, as those living in states with no mandate must be able pay the cost of IVF procedures, as well as the cost of PGT if desired, they noted.
“Because fertility centers may offer patients the choice to select the sex of their embryo after preimplantation genetic testing, this may in effect permit elective sex selection,” the researchers said. The shift in the male-female sex ratio in these cases “is concerning given the implications for future social demographics as IVF and preimplantation genetic testing utilization increase, and the negative effect outcomes could have on medical insurance policy and allocation of resources for medically indicated IVF and preimplantation genetic testing.”
The study findings were limited by several factors including the lack of clinic identifiers and lack of data characteristics including, race, ethnicity, and previous live births, the researchers noted. Other limitations included a lack of data on the sex preferences of the couple, and whether the sex of the embryo was known, and whether male and female embryos were transferred. Also, no states have mandates to cover PGT, and the limited study period may not generalize to current practices.
However, the study strengths include the large size and comprehensive database, and have implications for future policies and expansion of insurance coverage for infertility treatment and for preventing transmission of genetic diseases, they said.