Sex hormone patterns and serum retinol concentrations in adolescent girls.

Objective: To describe the pattern and relation of sex serum hormones and retinol concentrations over 1 menstrual cycle in adolescent girls living in a resource-poor setting.

Study Design: Venous blood samples were collected on alternate days of the cycle, and estrogen, progesterone, luteinizing hormone (LH), follicle stimulating hormone and serum retinol were measured. A linear random effects model was used to examine the relationship between sex hormones and serum retinol.