Factor XI, Activity
0030110
 
Ordering Recommendation
Order to diagnose factor XI deficiency (hemophilia C).
Mnemonic
F11
Methodology
Clotting
Performed
Mon-Fri
Reported
1-4 days
New York DOH Approval Status
This test is New York DOH approved.
Specimen Required
Patient Preparation
 
Collect
Lt. blue (sodium citrate). Refer to Specimen Handling at aruplab.com for hemostasis/thrombosis specimen handling guidelines.  
Specimen Preparation
Transfer 2 mL platelet-poor plasma to an ARUP Standard Transport Tube. (Min: 1 mL)  
Storage/Transport Temperature
CRITICAL FROZEN. Separate specimens must be submitted when multiple tests are ordered.  
Unacceptable Conditions
Serum. Non-frozen or hemolyzed specimens.  
Remarks
 
Stability
Ambient: 4 hours; Refrigerated: 4 hours; Frozen: 2 weeks  
Reference Interval
1-4 days: 10-66%
5-29 days: 23-87%
30-89 days: 27-79%
90-179 days: 41-97%
180-364 days: 38-134%
1-5 years: 56-150%
6 years: 52-120%
7-9 years: 70-138%
10-11 years: 66-137%
12-13 years: 68-138%
14-15 years: 57-129%
16-17 years: 65-159%
18 years and older: 56-153%
Interpretive Data
Note
CPT Code(s)
85270
Components
Component Test Code*Component Chart Name
0030110Factor XI, Activity
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, contact interface support at interface.support@aruplab.com.
Cross References
  • Antihemophilic Factor C
  • Coagulation Factor XI Activity Assay, Plasma
  • F11
  • Factor XI Activity Assay
  • Intrinsic Factor Proteins
  • Intrinsic Factors
  • Plasma Thromboplastin Antecedent (PTA)