Test Code HEPXA Heparin Anti-Xa Assay, Plasma

Methodology

Turbidometric

Aspen Valley Hospital

Container/Tube: Light blue-top (sodium citrate) tube(s)

Specimen: 1 mL of sodium citrate plasma

Transport Temperature: Ambient

Collection Instructions: If there is a delay in transport of >4 hours, spin down and send 1 mL of platelet-poor plasma frozen in plastic vial.

Unfractionated heparin: 0.32-0.67 IU/mL

The therapeutic range is specific for each low molecular weight heparin.

Enoxaparin (LOVENOX®):

0.60-1.00 IU/mL (twice-daily dose)

1.00-2.00 IU/mL (once-daily dose)

Dalteparin (Fragmin): 1.05 IU/mL (target)

Reference: CHEST 2004, Sept;126(3):188S-203S

Monday through Sunday

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