Two-stage chromogenic anti-IIa method for measuring heparin activity (UFH or LMWH) in the presence of a constant amount of antithrombin (AT), in compliance with pharmacopoeias. For testing in human citrated plasma or purified solutions.

Meets USP and European Pharmacopoeia (EP) requirements.

• Range: 0–1 IU/mL in plasma; 0.002–0.04 IU/mL in purified systems
• For heparin anti-thrombin activity testing per pharmacopoeia