GH response to provocative tests (ITT and CT) and serum IGF-I were measured by chemiluminescent immunometric assay (Immulite 1000; Diagnostic Products Corp., Los Angeles, CA, USA). The calibration range for IGF-I was up to 1.6 μg/L against the WHO NIBSC 1st IRR 87/518 and the sensitivity of the test was 20 μg/L. Whether calibration range for GH assay was up to 40 μg/L (WHO 1st IS 80/505 and WHO 2nd IS 98/574) and the sensitivity of the test was up to 0.01 μg/L. Consistency of assay performance was assessed by regular use of internal controls. The GH intra- and inter-assay coefficients of variation were, respectively, 5.3–6.5% at GH levels of 1.7–31 μg/L and 5.5–6.2% at GH levels of 3–18 μg/L. The intra- and inter-assay coefficients of variation for IGF-I were <4.5% and <8.4% (20, 21).
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