Pro-Vent® Plus 1 mL Arterial Blood Sampling syringes utilize dry lithium heparin with a low concentration of 7 I.U. per mL. The low heparin concentration allows for healthcare professionals to obtain very small blood samples and still maintain the full range of blood gas, electrolyte, and metabolite testing with reduced heparin interference and extended clotting time. Results remain consistent and accurate regardless of fill volume from 0.25 mL to 1.0 mL.