One-Stage Clotting Factor Assay

**Semantic type:** Laboratory Procedure

**Definition:** A clotting factor assay where FVIII-deficient plasma is added to test plasma and the APTT reagent, mixed and incubated for 3-5 min. The mixture is then recalcified, and the coagulation time is recorded and compared to a standard curve.

**Synonyms:** - One-Stage Clotting Assay