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Samples in periodicals archive:
One-stage prothrombin time (PT) test and activated partial thromboplastin time (APTT) test; approved guideline.
Clinical and Laboratory Standards Institute (CLSI) recently published an updated document, One-Stage Prothrombin Time (PT) Test and Activated Partial Thromboplastin Time (APTT) Test; Approved Guideline--Second Edition (H47-A2), which provides guidelines for performing the PT and APTT tests in the clinical laboratory, for reporting results, and for identifying sources of error.