title: Determination of serum unconjugated estrone, estradiol-17 beta and estriol during pregnancy by selected ion monitoring.
abstract: A simple, rapid and highly specific method by selected ion monitoring (SIM), using 9 alpha, 11 alpha-[2H2]estrone, [2,4-2H2]estradiol-17 beta and 2,4-[2H2]estriol as internal standards, was developed for the determination of serum estrogens during pregnancy. Serum samples were submitted to a simple extraction procedure and were analysed after formation of the trifluoroacetic anhydride derivative. The inter-assay coefficients of variation for estrone, estradiol-17 beta and estriol were 3.73%, 3.42% and 3.49%, respectively. The results obtained by SIM were compared with analysis performed using radioimmunoassay.
mesh_terms: D004958:Estradiol / Q000097:blood; D004964:Estriol / Q000097:blood; D004967:Estrogens / Q000097:blood*; D004970:Estrone / Q000097:blood; D005260:Female; D008401:Gas Chromatography-Mass Spectrometry; D006801:Humans; D011247:Pregnancy
chemical_list: D004967:Estrogens; D004970:Estrone; D004958:Estradiol; D004964:Estriol