Tests of Hypercoagulability (Plasma) Tests for APC Resistance (Plasma) n-APC Ratio n-APC Ratio Reference Ranges : > 0.86 : Normal 0.80-0.86 : Borderline < 0.80 : Abnormal Tests for Lupus Inhibitor (Plasma) APTT (Filtered) T/F sec (25.0-37.0) LAS Ratio/LAC Ratio ( <1.20 ) Lupus Inhibitor Comment: T/F