Association of blood type and patient characteristics with ovarian reserve.

Objective: To assess whether blood type was associated with diminished ovarian reserve (DOR) (day-3 follicle-stimulating hormone level >10 IU/L), controlling for history of tobacco smoking, body mass index (BMI), history of endometriosis, ovarian surgery, previous pregnancy, and maternal age.

Design: Cross-sectional study.

Setting: Academic medical center, Division of Reproductive Endocrinology and Infertility.