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The use of a commercially available somatomedin-C radioimmunoassay in patients with disorders of growth.
Journal of Pediatrics 1981 November
Somatomedin-C concentrations were measured by a newly available commercial radioimmunoassay in plasma samples from 41 children undergoing clinical evaluation of hypothalamic-pituitary function because of varied disorders of growth. Sequential Sm-C levels were stable; the coefficient of variation remained below 10% over a three-hour period. The Sm-C values of 27% of the children were discordant with the GH responses; of 25 patients with normal provoked-GH levels, seven had low Sm-C values, whereas four of 16 patients with inadequate GH responses had normal Sm-C concentrations. All of the discordant data occurred in 31 patients with diminished linear growth velocity. More patients with decreased growth velocity had diminished Sm-C levels than did short children with normal linear growth velocity. These data suggest that many variables, in addition to adequacy of GH production and plasma Sm-C levels, may affect net Sm-C activity. This possibly reduces the usefulness of the Sm-C radioimmunoassay as a single screening test for abnormalities of GH secretion.
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