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Factor XII, Activity
0030115
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Ordering Recommendation
Evaluate the cause of an isolated prolonged partial thromboplastin time (PTT) in a patient who is not currently bleeding.
Mnemonic
F12
Methodology
Electromagnetic Mechanical Clot Detection
Performed
Mon-Sat
Reported
1-3 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. EDTA plasma, clotted or hemolyzed specimens.
Remarks
Stability
Ambient: 4 hours; Refrigerated: Unacceptable; Frozen: 2 weeks
Reference Interval
58-166%
Interpretive Data
Compliance Category
Standard
Note
Hotline History
N/A
CPT Codes
85280
Components
| Component Test Code* | Component Chart Name | LOINC |
|---|---|---|
| 0030115 | Factor XII, Activity | 3232-6 |
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.
Aliases
- Coagulation Factor XII Activity Assay, Plasma
- Factor X11a
- Hageman factor
- Hageman Factor (Contact Factor)
- Intrinsic Factor Proteins
- Intrinsic Factors
- Surface Factor
Factor XII, Activity
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