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Urinary concentrations of immunoreactive human epidermal growth factor (hEGF) were determined by specific homologous radioimmunoassay in 169 healthy men (aged 20-69 years), 275 healthy women (20-8 years). healthy women (20-68 years) and 413 pregnant women (20-39 years). Relative hEGF concentrations in urine (micrograms/g creatinine) decreased significantly in both sexes between 24 and 64 years of age. The relative concentrations of hEGF in urine were significantly higher in women than in men at ages 20-69 years. The mean values of relative urinary hEGF concentrations in pregnant women in their twenties and thirties (30.0 +/- 0.7 micrograms/g creatinine and 29.6 +/- 1.2 micrograms/g creatinine) were significantly higher than those in age-matched nonpregnant women (27.3 +/- 1.8 micrograms/g creatinine and 22.8 +/- 0.7 micrograms/g creatinine). Among the trimesters, it was highest in the 2nd trimester of women in the twenties and thirties (33.4 +/- 1.3 micrograms/g creatinine and 31.7 +/- 1.9 micrograms/g creatinine). The significance of the increased urinary excretion of hEGF (micrograms/g creatinine) in pregnancy is not known. Further studies are required to find a source of hEGF in urine and a possible relation between increased hEGF excretion and fetoplacental growth and development.
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