What is the commonly used heparin concentration in hemodialysis?

• A. 1000 units/mL
• B. 100 units/mL
• C. 500 units/mL
• D. 10,000 units/mL

Answer: (A)

In hemodialysis, blood is pumped through an artificial circuit, and anticoagulation is used to prevent clotting in that circuit. The concentration most commonly used for heparinized solutions in the dialysis circuit is 1000 units per milliliter. This strength lets clinicians deliver an effective anticoagulant with small volumes, helping to control dosing and reduce the risk of excessive systemic bleeding. Higher concentrations would raise bleeding risk if absorbed, while lower concentrations would require larger volumes to achieve the same effect and could be less reliable. Facilities tailor the dose to the patient, but 1000 units/mL is the standard reference point for dialytic anticoagulation.