Question: what is anti xa factor?
Answer: 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.