Anti-Xa Activity International Unit

**Semantic type:** Quantitative Concept

**Definition:** A unit of unfractionated or low molecular weight heparin anticoagulation potency determined as the amount that neutralizes one unit of coagulation factor Xa preparation defined as an international biological standard by WHO First International Low Molecular Weight Heparin Reference Standard.

**Synonyms:** - anti-Xa IU - anti-Xa IU - anti-Xa IU - anti-Xa activity international unit(s) - {anti-Xa IU} - {anti-Xa IU}