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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)

Performing Laboratory

Rutland Regional Medical Center Laboratory

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.

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