An enzyme-linked immunosorbent assay for fetal steroid binding protein of human serum

M J Iqbal, A Forbes, T P Corbishley, M L Wilkinson, R Williams

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The binding characteristics and quantitation of the recently reported fetal steroid binding protein (FSBP) cannot be determined on unpurified samples; an immunoassay was therefore desirable. The protein was purified to homogeneity in order to raise a highly specific polyclonal antibody. An enzyme-linked immunosorbent assay applicable to unpurified samples was developed. Intra- and inter-assay coefficients of variation are 8.0% and 9.2% respectively; there is a sensitivity of 30 fmol FSBP per well, and there is no cross-reactivity with other binding proteins. Results obtained with the assay correlate with the more complex ligand binding assay (r = 0.85; p less than 0.02). Measurement of sera showed that FSBP levels are higher in women than in men (51.2 +/- 10.62 nM; 41.2 +/- 13.65 respectively; p less than 0.05) and are elevated in cirrhotic women (66.4 +/- 18.67; p less than 0.05) and in males with hepatocellular carcinoma (62.2 +/- 13.05; p less than 0.002). Use of the enzyme-linked immunosorbent assay confirmed the identity of FSBP separate from sex hormone binding globulin.
Original languageEnglish
Pages (from-to)31-8
Number of pages8
Issue number1
Publication statusPublished - Jan 1985


  • Carcinoma, Hepatocellular
  • Carrier Proteins
  • Enzyme-Linked Immunosorbent Assay
  • Female
  • Fetus
  • Humans
  • Liver Cirrhosis
  • Liver Neoplasms
  • Male
  • Pregnancy
  • Quality Control
  • Sex Hormone-Binding Globulin
  • Steroids

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