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ADAMTS13 (von Willebrand Factor-cleaving protease) Activity 

Tube type = Light Blue Top

Tube Type (x2)

Test ID LAB5317
EPIC Order
 ADAMTS13, VWF CLEAVING PROTEASE
CPT Code(s) 85397
Group/Individual Test Group
Laboratory Special Coagulation
Tube Station 30
Specimen Routine: 3.0 mL blood/light blue sodium citrate tubes x 2; See Comments
Stability
Unspun - 4 hrs
Room Temp - 4 hrs
Refrigerated - NO
Frozen - 6 months
Availability Routine: Weekly
Turnaround Time 7 Business Days
Internal Reference Testing & Outreach Handling Instructions Platelet poor plasma (double spun). Aliquot and freeze within 4 hours.
Reference Range Activity: >79 %
Comments
Deliver to the laboratory immediately.

ADAMTS13 Inhibitor, send out test, will reflex with ADAMTS13 Activity ≤20%.

Reviewed by J. Carr on January 14, 2026

UNC Hospitals
McLendon Clinical Laboratories
101 Manning Drive
Chapel Hill, NC 27514