Summary
The 24‐hour urinary excretion of luteinizing hormone (LH) was determinded in 24 girls, aged 4 to 11 years, and in 15 normal menstruating women, aged 18 to 44 years, by an immunological method using the haemagglutination inhibition reaction after a tannic acid extraction. LH was detected in every subject investigated. The mean value for urinary LH excretion in girls was equivalent to 3.8 i.u. (2nd IRP‐HMG) per 24 hours (range 1.2–8.0) and was 29.8 i.u. per 24 hours (range 24.0 to 38.0) in adult women. In girls the LH output increased significantly with age. In normally menstruating adult women, the LH output increased slightly but not significantly with age.
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