Activated PTT/Standard Ratio Measurement

**Semantic type:** Laboratory Procedure

**Definition:** The determination of the ratio of a subject's partial thromboplastin time to a standard or control partial thromboplastin time. The measurement may be expressed as a ratio or percentage.

**Synonyms:** - APTTSTND - Activated PTT to Standard PTT Ratio Measurement - Activated PTT/Standard - Activated PTT/Standard - Activated PTT/Standard PTT - Activated Partial Thromboplastin Time/Standard Thromboplastin Time