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Anti-Xa for Low Molecular Weight Heparin

Centralized Core Laboratory - : Hematology

Test ID :
Test Workstation :
Specimen Type:
Tube Type:
Blue top (sodium citrate) tube
Collection Volume:
2.7 mL (minimum 1.8 mL) Must use appropriate sodium citrate tube based on volume of blood drawn (1.8 mL or 2.7 mL tube)
Daily; 7:00-3:00
Chromogenic Assay
Special Instructions:
Send Whole by courier STAT to Akron Childrens Lab. Specimen must be received within 1 hour of collection. Laboratory monitoring of LMWH is usually not necessary. In certain clinical situations (i.e. obesity or renal failure) monitoring may be indicated. Chromogenic antiXa assay is the recommended test. This assay should be obtained 4 hours after the dose is administered. Assays within 1 to 2 hours of dose are often very low as are tests > 8 hours after dose. (there is no "steady state") A conservative therapeutic range is 0.61.2 IU/mL.
24 Hours
Additional Info:
  • Reference Range:
  • Prophylaxis: 0.2-0.4 IU/mL
  • Therapeutic: 0.6-1.2 IU/mL
  • CPT Code:

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