OBJECTIVE: The purpose of this study was to compare results obtained for the prothrombin
time (PT) and the activated partial thromboplastin time (APTT) using specimens drawn with …

We evaluated the necessity of drawing a discard tube on prothrombin time (PT) and
activated partial thromboplastin time (APTT) results in outpatients taking oral anticoagulant …

MATERIALS AND METHODS After obtaining informed consent, we obtained two tubes
ofcitrated blood (blue-stoppered, citrated Vacutainer" tube) from 95 subjects: 15 normal …

Discard tubes have traditionally been obtained when drawing samples for coagulation
testing to avoid potential tissue factor activation of coagulation in the first tube that may lead …

Abstract The Clinical and Laboratory Standards Institute (CLSI) recently abandoned its
recommendation for drawing a discard tube when performing a prothrombin time …

Prothrombin time (PT) and activated partial thromboplastin time (aPTT) are common
laboratory tests that are useful in the diagnosis of coagulation disorders and monitoring …

We evaluated the effect of sample volume and citrate concentration on results of routine
coagulation assays (prothrombin time [PT] and activated partial thromboplastin time [APTT]) …

We conducted studies to determine at what time point an add-on prothrombin time (PT) or
activated partial thromboplastin time (APTT) test can be honored on specimens that have …

BACKGROUND: Blood samples obtained through heparinized arterial catheters are used
routinely for a variety of laboratory tests. Accuracy of coagulation studies performed from …

This study was undertaken to determine an acceptable range of specimen volumes for
routine coagulation tests, that is, the prothrombin time (PT) and activated partial …