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Test Code ADAMTS13 Von Willebrand Cleaving Protease Act/Inh

Clinical System Name

Von Willebrand Cleaving Protease Act/Inh


VWF Cleaving Protease Activity + Inhibitor

ADAMTS–13 Protease Activity

ADAMTS–13 Inhibitor Assay

Sample Requirements

Specimen: Whole Blood

Container(s): Lt. Blue/Citrate

Preferred Vol: 3 x 1.8 mL or 2 x 2.7 mL

Minimum Vol: 2 x 1.8 mL or 1 x 2.7 mL


Note: Preferred method of collection is venipuncture with vacuum fill.  Test results are affected by incorrect blood volume. Use of a Vascular Access Device for the  collection of coag testing is not recommended. If this method is used it requires a 5 cc clearing volume; 3 cc for size 2 French catheter or smaller. Blood must be trasferred to the  Lt Blue/Citrate tube by use of a  blood transfer device to ensure proper fill. Specimen should be centrifuged within 3 hours of collection.


Processing Instructions

Reject due to: Hemolysis.

Spin: N

Aliquot: N

Temp: See Below

Storage location: CPA: Deliver whole blood to core coag bench. Core: Spin blood within 3 hours of collection. Remove and re-spin the plasma. Transer upper 3/4 layer of plasma to 2 send outs aliquot containers affixed with a large Cerner label and freeze in the CPA -70 C freezer, Send Outs rack. 


Off-site collection:


STAT Performed TAT
N Daily 3 - 5 d


Performing Laboratory

Bloodworks Northwest

Hemostasis Laboratory
921 Terry Ave
Seattle WA 98104

Phone: (206) 689-6594


Department: Send Outs


Phone: (206) 987-2563

Reference Range

ADAMTS13 Activity: >60% activity

ADAMTS13 Inhibitor: <32% inhibition



Method: None specified

Analytical Volume: None specified


CPT Codes



Send Out Instructions

Reference Test Name: ADAMTS 13 Activity and ADAMTS 13 Inhibitor
Reference Test Number: 3260-01 and 3260-02
Instructions: Send frozen samples on dry ice to Bloodworks Northwest via courier.