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Anti-Xa for Low Molecular Weight Heparin

Centralized Core Laboratory : Hematology

Test ID/Workstation :
LMWH ACOAG
Specimen Type:
Blood
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)
Storage:
Frozen
Availability:
Daily; 7:00-3:00
Methodology:
Chromogenic Assay
Special Instructions:
Send by courier STAT to Hospital lab Laboratory monitoring of LMWH is usually not necessary. In certain clinical situations (i.e. obesity or renal failure) monitoring may be indicated. Chromogenic anti-Xa 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 0.6-1.2 IU/mL.
Lab/Phone:
330-543-8418
TAT:
24 Hours
Additional Info:
Reference Range: Prophylaxis: 0.2-0.4 IU/mL Therapeutic: 0.6-1.2 IU/mL
CPT Code:
85520