title: Precision and accuracy of CoaguChek S and XS monitors: the need for external quality assessment.
authors.forename: Leon
authors.initials: L
authors.lastname: Poller
mesh_terms: D000925:Anticoagulants / Q000008:administration & dosage*; D002138:Calibration; D003374:Coumarins / Q000008:administration & dosage*; D016903:Drug Monitoring / Q000295:instrumentation*; D005069:Evaluation Studies as Topic; D006801:Humans; D019934:International Normalized Ratio / Q000295:instrumentation*; D011786:Quality Control; D012680:Sensitivity and Specificity
chemical_list: D000925:Anticoagulants; D003374:Coumarins; C030123:coumarin