Heparin Assay (Unfractionated Heparin Anti Xa)
Label Mnemonic: HEP
Epic code: LAB317
Downtime form: Doctor/Provider Orders - Pathology Core and Specialty Care Nursery
Hemostasis/Thrombosis
6240 RCP
356-3573
Specimen(s):
Citrated Plasma More information
Collection Medium:
Light Blue top tube 1.8 mL (Na Citrate)
Minimum:

Full draw; 1.8 mL light blue top (3.2% sodium citrate) tube. Mix well.

Delivery Instructions:
Deliver to laboratory within 1 hour of collection.
Testing Schedule:
24 hrs/day, 7 days a week, including holidays.
Turn Around Time:
2 hours (upon receipt in laboratory)
Comments:

Site of anticoagulant infusion and site of blood collection must be entered at time of collection.

Recommended target range for treatment of DVT or venous thromboembolism is 0.4-0.7 U/mL.

 

High doses of unfractionated heparin with low anti-Xa results could be due to low antithrombin activity.

Methodology:

Anti Xa activity by chromogenic substrate without antithrombin supplementation.

Assay updated to Siemens Innovance reagent on 03/05/19.

CPT Code:
85520
 
See Additional Information:
Hemolysis Chart
Phlebotomy Tubes and Order of Draw
Impact of Common Anticoagulants on Coagulation Tests