Partial Thromboplastin Time to Standard Thromboplastin Time Ratio Measurement

**Semantic type:** Laboratory Procedure

**Definition:** The determination of the ratio of the subject's partial thromboplastin time to a standard or control partial thromboplastin time.

**Synonyms:** - PTT/Standard - PTT/Standard - PTT/Standard PTT - PTTSTND - Partial Thromboplastin Time/Standard Thromboplastin Time