Factor 12 activity

Alphabetical Test listing

Factor 12 activity-994

  
Factor 12 activity
  
994
  
LAB994
  
MSO
  
Factor XII activity
Hageman factor
Surface factor
  

Evaluate a prolonged aPTT and detect specific coagulation factor XII activity

  
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.
  
  1. Spin
  2. Transfer plasma to a Screw-cap polypropylene frozen transport vial/tube - 4mL (LabCorp)
  3. Freeze

To avoid delays in turnaround time when requesting multiple tests on frozen samples, submit a separate frozen aliquot for each test requested.

 

  

Frozen

  
  • Severe hemolysis
  • Improper labeling
  • Clotted specimen
  • Specimen diluted with I.V. fluids
  • Samples thawed in transit
  • Improper sample type
  • Sample out of stability
  
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.

  

50 - 150%

  
85280
  
Result 3232-6
  
05/29/2019
  
05/29/2019