Factor XII Assay
Test Mnemonic
FXIIC
CPT Codes
- 85280 - QTY (1)
LOINC ®
3232-6
Performing Laboratory
Cleveland Clinic Laboratories
Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 2 mL | Plasma | Sodium citrate (Lt. Blue) | Frozen | Indicate previous prothrombin and partial thromboplastin time results on requisition. |
Minimum Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 1 mL |
Stability
| Environmental Condition | Description |
|---|---|
| Ambient | 4 hours |
| Refrigerated | Unacceptable |
| Frozen | 14 days at -20 C; 6 months at -70 C |
Days Performed
Mon - Fri
Turnaround Time
1 - 3 days
Methodology
| Name | Description |
|---|---|
| Clotting Assay |
Special Info
Patient Preparation: If possible, discontinue heparin therapy 2 days prior to test. Failure to follow patient preparation instructions above will render results invalid. 3.2% sodium citrate is the preferred anticoagulant recommended by CLSI.
Clinical Info
To diagnose a factor deficiency in a patient with a prolonged PTT and normal PT.