ARUP's Laboratory Test Directory

Heparin Anti-Xa, Low Molecular Weight Heparin : 0030144

Mnemonic: HA LMW

Methodology: Chromogenic Assay
Performed: Sun-Sat
Reported: Within 24 hours
Specimen Required: Collect: Lt. blue (sodium citrate). Refer to Specimen Handling at aruplab.com for hemostasis/thrombosis specimen handling guidelines.

Specimen Preparation: Centrifuge specimen within one hour of collection. Transport 2 mL platelet-poor plasma. (Min: 1.5 mL)

Storage/Transport Temperature: Frozen.

Remarks: Record heparin type on test request form.

Unacceptable Conditions: Serum. EDTA, oxalate, heparin, or plasma separator tubes. Specimens refrigerated more than eight hours. Hemolyzed specimens.

Stability (collection to initiation of testing): After separation from cells: Ambient: 4 hours; Refrigerated: 8 hours; Frozen: 2 weeks

Reference Interval:
0.50-1.10 U/mL
Interpretive Data: Therapeutic range based on enoxaparin brand low molecular weight heparin.
CPT Code(s): 85520