APTT-LA Screen to Confirm Percent Difference

**Semantic type:** Laboratory Procedure

**Definition:** A measurement to confirm the presence of Lupus anticoagulants, calculated as [(Screen aPTT - Confirm aPTT)/Screen aPTT]x100.

**Synonyms:** - APLASCPD - APTT-LA Screen to Confirm Pct Difference - PTT-LA Screen to Confirm Pct Difference