Is IGF binding protein-3 assessment helpful for the diagnosis of GH deficiency?

Clinical Endocrinology
Stefano CianfaraniBrunetto Boscherini

Abstract

The measurement of serum immunoreactive IGFBP-3 levels has been proposed as a screening test to identify children with growth hormone deficiency (GHD). We tested the sensitivity and specificity of the IGFBP-3 assessment in comparison with the measurement of IGF-I. We assessed the IGFBP-3 and IGF-I circulating levels in normal subjects and patients with GHD or idiopathic short stature (ISS). Eighty-two normal subjects, 16 GHD, and 10 children with ISS were studied. Controls were divided into three age groups: group A, 1-4 years (n = 16); group B, 5-9 years (n = 35), and group C, 10-14 years (n = 31). All subjects underwent standard anthropometry. In short patients, GH secretory status was assessed by clonidine and arginine stimulation tests. IGFBP-3 and IGF-I circulating levels were measured by radioimmunoassay. IGFBP-3 and IGF-I levels were closely related (r = 0.51, P < 0.0001) and IGFBP-3 was less age dependent than IGF-I (r = 0.57, P < 0.02 vs r = 0.64, P = 0.0001). Sensitivity (true positive ratio) and specificity (true negative ratio) of IGFBP-3 measurement were 50 and 92% respectively, whereas sensitivity and specificity of IGF-I assessment were 75 and 90% respectively. Below the age of 5 years, sensitivity was 20% for IG...Continue Reading

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May 6, 2004·Growth Hormone & IGF Research : Official Journal of the Growth Hormone Research Society and the International IGF Research Society·Laura M Gandrud, Darrell M Wilson
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