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Factor Inhibitor Assay

Test Number: 1502325
Revision Date 08/26/2014
Test Name Methodology LOINC Code
Factor Inhibitor Assay
Clot Detection 13591-3 
Specimen Specimen Volume (min) Specimen Type Specimen Container Transport Environment
Preferred 5.4 mL Whole Blood Sodium Citrate 3.2% (Blue Top) Room Temperature
Alternate 1 3 mL Double Spun Plasma Sterile, Capped Plastic Tube Frozen
Instructions Please indicate anticoagulant therapy - AND - the suspected factor inhibitor.
Collect Two
Sodium Citrate 3.2% (Blue Top) tubes.
Each 2.7mL Sodium Citrate 3.2% (Blue Top) tube must be filled to the proper level, no hemolysis. Improperly filled tubes can give erroneous results. Whole blood must be transported to lab immediately.
If testing cannot be started within 4 hours of collection the specimen must be double spun then 1.5mL plasma aliquot from each tube into individual plastic aliquot tubes and freeze. 
Do not pool aliquots together!
Testing Schedule Mon-Fri (Schedule permitting) 
Expected TAT 2-3 Days  
Clinical Use Specific factor inhibitors are immunoglobulins with specificity for a single coagulation protein. The most common specific inhibitors are antibodies produced in relation to Factor 8:C. 
Notes Testing includes a pathology interpretation.
CPT Code(s) 85335
Lab Section Coagulation