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Gonadotrophin determination in 24-h-urine by sensitive LH and FSH radioimmunoassays.

Urinary Lutropin (LH) and Follitropin (FSH) were precipitated with acetone and measured by specific radioimmunoassays. Recovery experiments with special regard to urinary pH values were done by adding 125I-labelled LH and FSH to unprocessed urine. At pH 4.5 68.6% of LH and 66.1% of FSH were recovered. Increasing pH values up to 6.0 resulted in a significant recovery loss of 125-I-LH, but not of 125I-FSH. Immunoreactive FSH concentrations decreased significantly 6 and 48 hours after storage began at room temperature. In healthy males and females we found mean LH and FSH concentrations in 24-h-urine which were similar to those reported by others: LH: males: 22.6 IU/24-h; cycling females: 17.8 IU/24-h; postmenopausal females: 49.1 IU/24-h; FSH: males 6.0 IU/24-h: cycling females: 15.0 IU/24-h; postmenopausal females: 48.5 IU/24-h. Because of their high sensitivity and practicability, we believe that these radioimmunoassays are clinically useful approaches in assessment of pituitary and gonadal disorders in human subjects.