Prolonged Partial Thromboplastin Time

**Semantic type:** Laboratory or Test Result

**Definition:** An abnormal laboratory test result in which the partial thromboplastin time is found to be greater than the control value. As a possible indicator of coagulopathy, a prolonged partial thromboplastin time (PTT) may occur in a variety of diseases and disorders, both primary and related to treatment.

**Synonyms:** - Activated partial thromboplastin time prolonged - Prolonged Activated Partial Thromboplastin Time