Factor 12 activity-994
Test info
Factor 12 activity
994
LAB994
MSO
Factor XII activity
Hageman factor
Surface factor
Hageman factor
Surface factor
Evaluate a prolonged aPTT and detect specific coagulation factor XII activity
Specimen
Sodium citrate (Na cit) plasma
1.0 mL
1.0 mL
- Collection tubes must be filled to completion to ensure a proper blood-to- anticoagulant ratio.
- If the patient's hematocrit exceeds 55%, the volume of citrate in the collection tube must be adjusted.
- The sample should be mixed immediately by gentle inversion at least six times to ensure adequate mixing of the anticoagulant with the blood.
- Spin
- Transfer plasma to a Screw-cap polypropylene frozen transport vial/tube - 4mL (LabCorp), labelled as Na cit plasma
- Freeze
Frozen
- Severe hemolysis
- Improper labeling
- Clotted specimen
- Specimen diluted with I.V. fluids
- Samples thawed in transit
- Improper sample type
- Sample out of stability
Performance
LabCorp Burlington (086322): R-NX
Tu - Fr
2 - 3 days
aPTT-based one-stage clotting time assay. Factor XII-depleted plasma is used as the substrate and the clotting time with the patient plasma is compared to the clotting time of normal pooled plasma.
Clinical and Interpretive info
50 - 150%
Billing
85280
Result 3232-6
Tracking
05/29/2019
05/29/2019
03/30/2022