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To study the feasibility of noninvasive sampling in pediatric patients, we examined the concentrations of LH and FSH in paired serum and urine samples from 65 children (age 0-15 y) with highly sensitive time-resolved immunofluorometric assays. The detection limits of the assays were 0.015 IU/L for LH and 0.018 IU/L for FSH. These sensitivity levels allowed quantification of the low prepubertal LH and FSH concentrations. The correlation between serum and urine gonadotropin values was very good (r = 0.751, p &lt; 0.001 for FSH; and r = 0.720, p &lt; 0.001 for LH), and the urine and serum concentrations were very similar. Correction of urinary gonadotropin concentrations for changes in urinary flow by standard methods using density [concentration x (0.02/density-1)] or creatinine (concentration/creatinine) did not improve the correlation. Therefore, measurement of urinary gonadotropins without correction can simply be used in the pediatric outpatient setting as a noninvasive alternative to serum determinations.

pediatric research

A Clinically Useful Method for Detecting Gonadotropins in Children: Assessment of Luteinizing Hormone and Follicle-Stimulating Hormone from Urine as an Alternative to Serum by Ultrasensitive Time-Resolved Immunofluorometric Assays