title: A competitive enzyme-linked immunosorbent assay for plasma 11-deoxycortisol (17,21-dihydroxy-4-pregnene-3,20-dione).
abstract: An enzyme-linked immunosorbent assay (ELISA) for 11-deoxycortisol is described for the first time. 11-Deoxycortisol-thyroglobulin conjugate is adsorbed onto the wells of a 96-well ELISA plate and competes with 11-deoxycortisol in the standards or plasma extract for antibody binding sites. After washing, immobilized primary antibody is probed with peroxidase-labeled goat anti-rabbit IgG. The ELISA plate is further washed and o-phenylenediamine added, color developed and the absorbance read at 492 nm. The ELISA shows good agreement with our existing 11-deoxycortisol radioimmunoassay (RIA) and has similar specificity and performance which allow its use in the routine steroid laboratory for assessing pituitary adrenal function by the metyrapone test.
mesh_terms: D015065:17-Hydroxycorticosteroids / Q000097:blood*; D000818:Animals; D003350:Cortodoxone / Q000097:blood*; D003480:Cushing Syndrome / Q000097:blood; D004797:Enzyme-Linked Immunosorbent Assay; D006801:Humans; D008797:Metyrapone; D011863:Radioimmunoassay
chemical_list: D015065:17-Hydroxycorticosteroids; D003350:Cortodoxone; D008797:Metyrapone