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Factor VIII Inhibitor
Message
Performed in the Hematology Laboratory x5475, 76. Sample MUST be drawn to minimum fill line on tube.
Test Code
F8INH
CPT Codes
85335
Preferred Specimen
plasma
Minimum Volume
2.7 mL. Sample MUST be drawn to minimum fill line on tube or the sample will be rejected as QNS.
Instructions
If drawn with other coagulation assays: for up to 3 tests draw2, 2.7mL sodium citrate tubes. For 4 or more coagulation tests, draw 3, 2.7 mL sodium citrate tubes.
Transport Container
Light Blue Top (Sodium Citrate), 2.7 mL draw tubes
Transport Temperature
Room temperature
Specimen Stability
Refrigerator Stability: 4 hours
Plasma is stable for 6 months frozen at -70 degrees C.
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Gross hemolysis, QNS, Clotted
Methodology
Optical clot detection
Setup Schedule
Monday-Friday from 8-4pm
Limitations
Testing not performed when F VIII activity level is greater than 25%
Reference Range
< 0.5 BU
Clinical Significance
Evaluated when hemophiliacs do not respond to treatment; if acquired (in elderly, post-partum, or autoimmune diseases), used to monitor treatment
