Overnight follicle stimulating hormone (FSH) and luteinizing hormone (LH) excretion in normal males.

FSH and LH in acetone precipitates of timed overnight urine collections were measured by radioimmunoassay. FSH and LH urinary excretion extrapolated to 24 h was determined in 147 boys 3–16 years and 20 normal men. FSH and LH (2nd IRP-HMG) progressively increased with age from 1.8 ± 1.1 (FSH) and 2.1 ± 1.2 (LH) IU/24 h for the 3–4 year age group to 8.6 ± 3.2 (FSH) and 18.8 ± 9.0 (LH) IU/24 h for the 15–16 year age group. FSH and LH excretion increased progressively with stage of sexual development. The integration of several hours of FSH and LH secretion and the accuracy, simplicity and convenience of collecting a single urine sample are advantages of the timed overnight urine collection which should make this technique extremely useful in the evaluation of gonadotropin function.