Prekallikrein assay-994

Test info

  
Prekallikrein assay
  
994
  
LAB994
  
MSO
  
Fletcher factor assay
PK
  

Measurement of prekallikrein factor concentration

Specimen

  
Sodium citrate (Na cit) plasma
  
  
2.0 mL
  
1.0 mL
  

Do not draw from an arm with a heparin lock or heparinized catheter.

  1. Blood should be collected in a blue-top tube containing 3.2% buffered sodium citrate
  2. Evacuated collection tubes must be filled to completion to ensure a proper blood to anticoagulant ratio. Coag - Tube fill guidelines
  3. Immediately following collection, mix sample thoroughly by gently inverting 8 - 10 times to prevent clotting
  
  1. Spin
  2. Transfer plasma to a Screw-cap polypropylene frozen transport vial/tube - 4mL (LabCorp), labelled as Na cit plasma
  3. Freeze
  

Frozen (preferred)

Ambient - 4 hours

Performance

  
LabCorp Burlington (500194): R-NX
  
We
  
4 - 8 days
  

Factor prekallikrein activity is determined utilizing an aPTT-based one-stage clotting time assay. Factor prekallikrein-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

  

Normal: ≥ 50 %

Billing

  
85292
  
Result 28659-1

Tracking

  
06/24/2019
  
02/17/2021