HEPARIN ANTI-Xa

Specimen Required
Draw blood in light blue 3.2% sodium citrate tube. See appendices for coagulation test collection instructions. Send 2.0 mL plasma (1.0 mL minimum) frozen in a screw-capped plastic vial.

Rejection Criteria
Hemolysis

Methodology
Chromogenic

Stability
Room Temperature: Unacceptable; Refrigerated: Unacceptable; Frozen: 30 days

Reference Range
Reference range for peak anti-Xa levels measured 4 hours after dosing:
Enoxaparin (Lovenox)
Prophylaxis:   0.3-0.6 IU/mL  
Therapeutic bid dosing:   0.6-1.0 IU/mL  
Therapeutic qD dosing:   >1.0 IU/mL  
Tinzaparin (Innohep) Therapeutic qD:   >0.85 IU/mL  
Dalteparin (Fragmin) Therapeutic qD:   >1.05 IU/mL  

Performed
Sunday-Friday

Turnaround Time3-5 days
Test CodeHEPXA
CPT-4 Code (s)
85520
LOINC Codes
3271-4

Warde
Medical
Laboratory