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Lab Test Dictionary

Factor VIII Inhibitor Panel (40083)


FVIII Bethesda Inhibitor; Factor VIII Inactivity; Inhibitor APTT; Factor 8 Inhibitor Evaluation; Nijmegen Assay

Specimen Type


Performing Lab

Quest Diagnostics San Juan Capistrano

Epic ID


Lab Test Days

Sunday, Tuesday, Thursday

Standard TAT

1-4 Days

Collection Information

Specimen Required

(three-four) 1.8 mL or (two-three) 2.7 mL Blood

Container Type

Light Blue (Sodium Citrate)

Processing Information - Lab Use Only

Transport Temperature


Specimen Stability

Room Temp=Unacceptable; Refrigerated=Unacceptable; Froze=14 Days

Test Volume Required

(two-three) 2 mL Platelet-Poor Plasma

Minimum Test Volume

(two-three) 1 mL Platelet-Poor Plasma

Processing Instructions

Centrifuge light blue-top tube 15 minutes at approx. 1500 g within 60 minutes of collection. Using a plastic pipette, remove plasma, taking care to avoid the WBC/platelet buffy layer an dplace into a plastic vial. Centrifuge a second time and transfer platelet-poor plasma into a new plastic vial. Plasma must be free of platelets (<10,000/mcl). Freeze immediately and send frozen..

Included Tests

Factor VIII Inhibitor, EIA Screen and Factor VIII Activity, Clotting. If Factor VIII Inhibitor, EIA Screen is positive, the Nijmegen Assay will be performed.

CPT Codes

85240, 85335; 85335