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Labcorp Oklahoma, Inc.
Test Directory


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Factor 11 (XI) Assay

Order Name FACTOR 11
Test Number: 1501300
Revision Date 02/09/2022
Test Name Methodology LOINC Code
Factor 11 (XI) Assay
Clot Detection 3226-8 
SPECIMEN REQUIREMENTS
Specimen Specimen Volume (min) Specimen Type Specimen Container Transport Environment
Preferred 2.7 mL Whole Blood Sodium Citrate 3.2% (Blue Top) Room Temperature
Alternate 1 1.5 mL Double Spun Plasma Sterile Screwtop Container Frozen
Instructions Please indicate anticoagulant therapy.
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!  
GENERAL INFORMATION
Testing Schedule Tue, Thr 
Expected TAT 2-3 Days  
Clinical Use This assay measures the clotting ability of Factor 11. This assay is used to aid in the diagnosis of coagulation deficiencies that may present with mild bleeding, bruising, epistaxis, retinal hemorrhage and menorrhagia. 
Notes Prepaired double spun plasma aliquots must be Frozen within 4 hours of collection!
CPT Code(s) 85270
Lab Section Coagulation