title: Standardization of prothrombin and activated partial thromboplastin time reagents and controls.
abstract: The problems of selection and standardization of reagents, selection of quality control standards, and maintaining quality controls are ourlined and discussed. Precise technic is emphasized, and sources of error and methods for correction of errors are reviewed.
mesh_terms: D001780:Blood Coagulation Tests; D006801:Humans; D007202:Indicators and Reagents / Q000592:standards*; D011517:Prothrombin Time; D011786:Quality Control; D013925:Thromboplastin
chemical_list: D007202:Indicators and Reagents; D013925:Thromboplastin