Association of body mass index, age, and cigarette smoking with serum testosterone levels in cycling women undergoing in vitro fertilization.

Objective: [1] To examine the effects of body mass index (BMI), age, cigarette smoking, cause of infertility, and use of oral contraceptives on baseline serum testosterone (T), and [2] to examine associations between baseline serum T and IVF outcomes such as pre-hCG serum E(2), number of oocytes retrieved, oocyte fertilization rate, and pregnancy outcome in regularly cycling women.

Design: Prospective, cohort study.

Setting: Three IVF programs in eastern Massachusetts.