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HelpTest Code HPXA Heparin Anti-Xa
Performing Laboratory
Hunterdon Medical Center
Useful For
Heparin Anti-Xa is used to measure heparin concentrations in patients receiving low molecular weight heparin (LMWH) or unfractionated heparin (UFH).
Special Instructions
Note: Specimen must be filled to the ETCHED line located on the tube to achieve a ratio of 9 parts blood to 1 part anticoagulant.
Specimen Required
Container/Tube: Blue Top (Na Citrate)
Specimen Volume: Must be filled to etched line located on tube
Specimen Type
Citrated plasma
Specimen Transport Temperature
Ambient temperature
Specimen Stability Information
| Patient status | Temperature | Time Frame |
| Heparinized | Ambient 15-25°C | 4 hrs uncentrifuged |
| Non-heparinized | Ambient 15-25°C | 24 hrs uncentrifuged |
Reject Specimen Due To
Tube not properly filled, underfilled or overfilled.
Clotted specimen
Hemolysis
Day(s) Performed
Monday through Sunday
Reference Values
| UFH Therapeutic Range |
| 0.30-0.70 IU/mL |
| LMWH Therapeutic Range | Notes |
| 0.50-1.00 IU/mL | For twice daily dosing* |
| 1.00 - 2.00 IU/mL | For once daily dosing* |
| *Sample obtained 4-6- hours following subcutaneous dosing |
| LMWH Prophylactic Range |
| 0.10 - 0.30 IU/mL |
Method Name
Chromogenic
CPT Code Information
85520
LOINC Code Information
3274-8