Factor IX Activity Actual to Control Ratio Measurement

**Semantic type:** Laboratory Procedure

**Definition:** The determination of the ratio of the biological activity of factor IX dependent coagulation in a subject's specimen when compared to the same activity in a control specimen. The measurement may be expressed as a ratio or percentage.

**Synonyms:** - FIXAAC - Factor IX Activity Actual/Control - Factor IX Activity Actual/Control - Factor IX Activity Actual/Factor IX Activity Control - Factor IX Activity Actual/Normal