title: Warfarin and warfarin-alcohol levels in anticoagulated patients.
abstract: The relationship between dosage, prothrombin ratio, and steady-state plasma concentrations of warfarin and warfarin-alcohol, were determined in 43 patients regularly attending an anticoagulant clinic. The warfarin and warfarin-alcohol concentrations were determined by a gas chromatographic mass spectroscopic (GC/MS) method. A significant correlation was found between the dose and the plasma level of warfarin. There was no significant correlation between the prothrombin ratio and the dose of warfarin, the steady-state plasma levels of warfarin or warfarin-alcohol, or the sum of their plasma concentrations. Measurement of the plasma levels of warfarin and warfarin-alcohol is likely to be of little help clinically other than to detect failure of compliance or malabsorption.
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D008401:Gas Chromatography-Mass Spectrometry; D006801:Humans; D008297:Male; D008875:Middle Aged; D011517:Prothrombin Time; D014859:Warfarin / Q000031:analogs & derivatives* / Q000097:blood / Q000627:therapeutic use
chemical_list: D014859:Warfarin