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A Robust Assay for Dexamethasone in Plasma Using a Heterologous 125I Radioligand and a Magnetizable Solid-Phase Antiserum

par Cook, Nigel N.J.;Read, Graham G.F.;Lejeune-Lenain, C. ;Riad-Fahmy, Diana
Référence Annals of clinical biochemistry, 27, 5, page (465-472)
Publication Publié, 1990

Article révisé par les pairs

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Résumé :

An assay using an antiserum raised against a dexamethasone 21-hemisuccinate conjugate and the heterologous radioligand dexamethasone 21-(carboxymethyl) ether was developed, validated, and used to study the pharmacokinetics of this steroid for 12 h following administration to patients with congenital adrenal hyperplasia. Coupling the antiserum to magnetizable cellulose allowed rapid separation of bound/free steroid. A C-21 rather than a C-3 antiserum was used to minimize interference with a main metabolite, 6β-hydroxydexamethasone. Close correspondence of assay (0·35 nmol/L) and curve (0·25 nmol/L) sensitivities suggests that interference by matrix effects is minimal. This was confirmed by good agreement in data from the in-house assay and that of a reference procedure. Good precision was demonstrated by the precision profile and Shewhart chart quality control data. The latter also demonstrated the assay was robust and reliable in routine practice. © 1990, Association for Clinical Biochemistry. All rights reserved.