Prothrombin time proficiency testing in the United States.
D000704:Analysis of Variance; D001322:Autoanalysis; D005069:Evaluation Studies as Topic; D006801:Humans; D007753:Laboratories / Q000592:standards; D007883:Legislation, Medical; D008004:Licensure; D010070:Oxalates / Q000592:standards; D011517:Prothrombin Time / Q000379:methods / Q000592:standards*; D011786:Quality Control; D013925:Thromboplastin / Q000592:standards; D014481:United States
D010070:Oxalates; D013925:Thromboplastin