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Anti Xa (LMWH)*

Important Note

*This test is orderable in Cerner as Anti Xa (LMWH)

**** Must be drawn at Rutland Regional Medical Center blood draw station due to specimen sensitivity****

For monitoring of patients on low molecular weight heparin (when criteria is met)

Consider only in:

- Extremes of body weight (<50kg or >150kg)

- Renal insufficiency (CrCl < 30mL/min)

- Pregnancy

- Chronic therapy (>10days)

Specimen Requirements

Specimen Type: Whole blood

Container/Tube: Light-blue top (citrate)

Specimen Volume: Full tube

Specimen Minimum Volume: 2.7 mL Collection Instructions: TUBE MUST BE FILLED TO LINE ON TUBE. (Do not under fill or overfill tube.) Send specimen in original tube.

Performing Laboratory

Rutland Regional Medical Center Laboratory

Reference Values

Therapeutic Ranges:

0.5 IU/mL to 1 IU/mL for Q12h Therapeutic dose LMWH

1 IU/mL to 2 IU/mL for Q24h Therapeutic dose LMWH

0.2 IU/mL to 0.4 IU/mL for Prophylactic dose LMWH

(sample obtained 4 to 6h following subcutaneous dosing)

Day(s) Performed

Daily

Analytical Time:

1 day

Available Stat

Methodology

Photo-Optical

Specimen Transport Temperature

Must be centrifuged within 1 hour and plasma separated. Must be processed within 2 hours.

CPT Code

85730