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HomeLaboratory MedicineAnti-Xa Assay (Heparin Assay)

Anti-Xa Assay (Heparin Assay)

Reference Range

The anti–factor Xa assay is designed to measure plasma heparin (unfractionated heparin [UH] and low molecular weight heparin [LMWH]) levels and to monitor anticoagulant therapy.

Therapeutic ranges of heparin are as follows:

LMWH: 0.5-1.2 IU/mL

UH: 0.3-0.7 IU/mL

Prophylactic ranges of heparin are as follows:

LMWH: 0.2-0.5 IU/mL

UH: 0.1-0.4 IU/mL

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