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SUMMARY The diurnal pattern of plasma growth hormone levels has been investigated in nine children, without endocrinopathy, aged 8–15 yr., from whom blood samples were taken hourly during the day and 2-hourly at night. Growth hormone was undetectable (< 1 μmg./ml.) during the first 2 hr. after meals but the levels rose thereafter to values many times higher than those found in adults. High values were consistently encountered during the night.
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Hunter et al. (1966) studied this question.
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