Measurement of serum free IGF-I in diagnosis of growth hormone deficiency.
Serum levels of total insulin-like growth factor-I (IGF-I) are growth hormone (GH) dependent and can be used as the screening tool for GH deficient status. However, most of them are bound to IGF-binding proteins, leaving less than 1 per cent in the free or unbound forms which represent the active biological fractions. Serum free IGF-I levels were measured by radioimmunoassay (IRMA) in 48 short children with various conditions. We found that the means +/- SEM of free IGF-I in children with panhypopituitarism (PAN) and complete growth hormone deficiencies (cGHD) were significantly lower than those in sex and age matched normal children (0.02 +/- 0.01 vs 2.01 +/- 0.7 ng/ml, p = 0.0006 and 0.42 +/- 0.18 vs 1.72 +/- 0.27 ng/ml, p = 0.0007 respectively) but not in children with partial growth hormone deficiencies (pGHD) (0.91 +/- 0.3 vs 1.97 +/- 0.4 ng/ml, p = 0.27) and idiopathic short stature (ISS) (0.94 +/- 0.3 vs 1.95 +/- 0.6 ng/ml, p = 0.13). However, when we classified the pGHD children into 2 groups according to IGFBP-3 SDS for normal Thai children, we found that the mean of free IGF-I levels in pGHD children with IGFBP-3 SDS < or = -1.3 was significantly lower than that of the controls. (0.68 +/- 0.55 vs 2.66 +/- 0.71 ng/ml, p = 0.04) In conclusion, the measurement of free IGF-I level can be used to evaluate the GH status of short children and might be used as a guide when starting treatment.
Wacharasindhu
S
S
Department of Pediatrics, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand.
Chaichanwatanakul
K
K
Likitmaskul
S
S
Angsusingha
K
K
D002648:Child; D002675:Child, Preschool; D005260:Female; D006130:Growth Disorders / Q000097:blood / Q000175:diagnosis*; D019382:Human Growth Hormone / Q000172:deficiency*; D006801:Humans; D007334:Insulin-Like Growth Factor I / Q000032:analysis*; D008297:Male; D011863:Radioimmunoassay; D012016:Reference Values; D012680:Sensitivity and Specificity
D019382:Human Growth Hormone; D007334:Insulin-Like Growth Factor I