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Test Code F8INH Factor VIII (F8) Inhibition

Collection Container

Light Blue

Specimen Required

Platelet poor plasma, whole blood if received in laboratory within 4 hours of collection

Specimen Volume

Platelet poor plasma-3.0 mL,whole blood 5.4 mL

Minimum Specimen Volume

Platelet poor plasma-2.0 mL,whole blood-2.7 ml

Special Handling Instructions

Spin down,remove plasma and spin again.Double centrifued specimen is critical for accurate results as platelet contamination may cause spurious results.

Transport Temperature

Platelet poor plasma-frozen, whole blood-ambient temperature

Specimen Stability

Whole blood-4 hours

Reasons for Rejection

Hemolyzed,clotted, Whole blood >4 hours old


Activated Partial Thromboplastin Clot-Based Assay

Reference Ranges


Turnaround Time

1-3 days,depending on receipt in laboratory

Day(s) and Time(s) Performed

7 AM-3 PM,Monday-Friday

Additional Information

Factor VIII will be performed prior to FVIII inhibitor.

CPT Code


Units of Measure

Bethesda Units