Factor XI, Activity
Ordering Recommendation
Order to diagnose factor XI deficiency (hemophilia C).
Methodology
Electromagnetic Mechanical Clot Detection
Performed
Mon-Sat
Reported
1-3 days
New York DOH Approval Status
Specimen Required
Lt. blue (sodium citrate). Refer to Specimen Handling at aruplab.com for hemostasis/thrombosis specimen handling guidelines.
Transfer 2 mL platelet-poor plasma to an ARUP Standard Transport Tube. (Min: 1 mL)
CRITICAL FROZEN. Separate specimens must be submitted when multiple tests are ordered.
Serum. EDTA plasma, clotted or hemolyzed specimens.
Ambient: 4 hours; Refrigerated: Unacceptable; Frozen: 2 weeks
Reference Interval
Age | Reference Interval | Age | Reference Interval |
---|---|---|---|
1-4 days | 10-66% | 7-9 years | 70-138% |
5-29 days | 23-87% | 10-11 years | 66-137% |
30-89 days | 27-79% | 12-13 years | 68-138% |
90-179 days | 41-97% | 14-15 years | 57-129% |
180-364 days | 38-134% | 16-17 years | 65-159% |
1-5 years | 56-150% | 18 years and older | 56-153% |
6 years | 52-120% |
Interpretive Data
Standard
Note
Hotline History
CPT Codes
85270
Components
Component Test Code* | Component Chart Name | LOINC |
---|---|---|
0030110 | Factor XI, Activity | 3226-8 |
Aliases
- Antihemophilic Factor C
- Coagulation Factor XI Activity Assay, Plasma
- F11
- Factor XI Activity Assay
- Intrinsic Factor Proteins
- Intrinsic Factors
- Plasma Thromboplastin Antecedent (PTA)