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However, even if the manufacturers follow the Consensus Recommendations Group on the Standardization and Evaluationof GH and IGF-I Assays (1), the different kits give very different results
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Reference values for insulin-like growth factor I (IGFI) serum concentrations: comparison of six immunoassays (2)
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(1) Clemmons DR. Consensus Statement on the Standardization and Evaluation of Growth Hormone and Insulin-like Growth Factor Assays. Clin Chem. 2011;57:555-559.

(2) J Clin Endocrinol Metab