Body mass index is not associated with embryo ploidy in patients undergoing in vitro fertilization with preimplantation genetic testing

Body mass index is not associated with the number or proportion of aneuploid, mosaic, or euploid embryos per cycle in a large cohort of patients undergoing in vitro fertilization with preimplantation genetic testing for aneuploidy.

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VOLUME 116, ISSUE 2, P388-395


Yael R. Stovezky, B.A., Phillip A. Romanski, M.D., Pietro Bortoletto, M.D., Steven D. Spandorfer, M.D.



To assess the association between body mass index (BMI) and embryo aneuploidy and mosaicism in a cohort of patients undergoing in vitro fertilization (IVF) with trophectoderm biopsy for preimplantation genetic testing for aneuploidy (PGT-A) using next-generation sequencing technology.


Retrospective cohort study.


Academic center.


Patients undergoing their first IVF cycle with trophectoderm biopsy and PGT-A at our center between January 1, 2017, and August 31, 2020. Patients classified as underweight on the basis of BMI (BMI <18.5 kg/m2) and patients who underwent fresh embryo transfers were excluded.



Main Outcome Measures

Number and proportion of aneuploid, mosaic, and euploid embryos.


The patients were stratified according to the World Health Organization’s BMI classification: normal weight (18.5–24.9 kg/m2, n = 1,254), overweight (25–29.9 kg/m2, n = 351), and obese (≥30 kg/m2, n = 145). Age-adjusted regression models showed no relationship between BMI classification and the number or proportion of aneuploid embryos. There were no statistically significant associations between BMI classifications and the number or proportion of mosaic or euploid embryos. A subgroup analysis of patients classified into age groups of <35, 35–40, and >40 years similarly showed no relationships between BMI and embryo ploidy outcomes.


Body mass index was not associated with the number or proportion of aneuploid, mosaic, or euploid embryos in this large cohort of patients undergoing IVF with PGT-A, suggesting that the negative effect of excess weight on reproductive outcomes was independent of the ploidy status of the embryo cohort.

Fertility and Sterility

Editorial Office, American Society for Reproductive Medicine

Fertility and Sterility® is an international journal for obstetricians, gynecologists, reproductive endocrinologists, urologists, basic scientists and others who treat and investigate problems of infertility and human reproductive disorders. 


Go to the profile of Pandiyan  Natarajan
2 months ago

Aneuploidy, Mosaicism are meiosis errors and are unrelated to body weight.

Body weight plays a crucial role in Reproductive performance. Excess body weight may lead to irregular cycles and anovulation due to altered endocrine milieu. Underweight may lead to Amenorrhoea due to switching off of the Hypothalamo Pituitary Ovarian axis. However the Gametes are unlikely to be affected by these BMI perturbations. This interesting paper confirms this logical conclusion. 

The poor Reproductive performance of some women with abnormal BMI is likely to be due to Endocrine or Uterine factors & not due to Embryonic factors as evidenced in this article.

Professor Dr Pandiyan Natarajan,

Professor and Head of the Department of Andrology and Reproductive Medicine,

Chettinad Super Speciality Hospital,

Chettinad Academy of Research and Education,

Kelambakkam, Chennai,

Tamil Nadu, India- 603103.