Ordering Recommendation
Monitor treatment efficacy of unfractionated heparin.
Mnemonic
Methodology
Chromogenic Assay
Performed
Sun-Sat
Reported
1-2 days
New York DOH Approval Status
Specimen Required
Lt. blue (sodium citrate). Refer to Specimen Handling at aruplab.com for hemostasis/thrombosis specimen handling guidelines.
Centrifuge specimen within one hour of collection. Transport 2 mL platelet-poor plasma. (Min: 1 mL)
Frozen.
Serum. EDTA, oxalate, heparin, or plasma separator tubes. Hemolyzed or clotted specimens.
This test cannot be used to quantitate anticoagulants other than unfractionated heparin. This includes, but is not limited to, direct oral anticoagulants and Fondaparinux (Arixtra).
After separation from cells: Ambient: Unacceptable; Refrigerated: Unacceptable; Frozen: 1 month
University of Utah Clients: After separation from cells: Ambient: 4 hours; Refrigerated: 8 hours; Frozen: 2 weeks
Reference Interval
0.35-0.70 U/mL
Interpretive Data
FDA
Note
Hotline History
Hotline History
CPT Codes
85520
Components
Component Test Code* | Component Chart Name | LOINC |
---|---|---|
0030143 | Heparin Anti-Xa Unfractionated | 3274-8 |
Aliases
- Anti-10a
- Anti-Xa
- Heparin Anti-Xa Assay
- Heparin Anti-Xa Assay, Plasma
- Unfractionated Heparin Assay