title: Applicability of recently established reference values for serum insulin-like growth factor 1: A comparison of two assays--an (automated) chemiluminescence immunoassay and an enzyme-linked immunosorbent assay.
abstract: Analysis and interpretation of insulin-like growth factor 1 in serum (IGF-1) is a principal diagnostic and follow-up tool in growth hormone-related disorders and is becoming of interest for many other disorders. Only for the automated chemiluminescence immunoassay Nichols Advantage have age- and sex-specific reference values based on a large population and valid for different laboratories been established. The aim of the present study was to compare two different assays (the automated chemiluminescence immunoassay and the enzyme-linked immunosorbent assay DSL-10-2800) in order to prove applicability of recently published reference values. The study included 95 serum samples from 88 patients, adults as well as children, with different or no endocrine disorders, and acromegalic as well as growth hormone-deficient patients. IGF-1 measurements were performed with both methods. The results have shown a very high correlation between the IGF-1 values obtained with the two assays (r=0.971, p<0.0001). In conclusion, the reference values established for the chemiluminescence assay are applicable also for the enzyme-linked immunosorbent assay.
authors.affiliation: Division of Endocrinology & Diabetology, Philipps University Hospital, Marburg, Germany. ivan@med.uni-marburg.de
authors.forename: Diana
authors.initials: D
authors.lastname: Ivan
authors.forename: Georg
authors.initials: G
authors.lastname: Brabant
authors.forename: Peter H
authors.initials: PH
authors.lastname: Kann
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D004797:Enzyme-Linked Immunosorbent Assay / Q000592:standards; D005260:Female; D006801:Humans; D007118:Immunoassay / Q000379:methods / Q000592:standards*; D007223:Infant; D007334:Insulin-Like Growth Factor I / Q000032:analysis* / Q000592:standards; D008163:Luminescent Measurements / Q000592:standards; D008297:Male; D012016:Reference Values; D015203:Reproducibility of Results
chemical_list: D007334:Insulin-Like Growth Factor I