Prolonged Clotting Time Evaluation

Clotting time tests such as prothrombin time (PT) and/or activated partial thromboplastin time (aPTT) are commonly performed in the outpatient or hospital setting to evaluate the hemostatic system for a variety of reasons. Symptoms associated with prolonged clotting times depend on underlying etiology.  Prolonged clotting times of unclear etiology require further evaluation to determine the cause and exclude clinically significant bleeding disorders. Panel tests with reflex testing for the workup of unexpected prolonged clotting times can reduce the number of times blood will need to be drawn to establish diagnosis and can lead to more rapid diagnosis. It is important to note that anticoagulant medications may impact testing, as can a recent blood transfusion or factor replacement, and appropriate specimen handling is critical to ensure accuracy of results.

Tabs Content
Content Review: 
July 2018

Last Update: July 2019