Hemodilution Calculator

Estimate final hematocrit and calculate required blood volume.

Input Parameters

Enter patient, prime, and target data.

Clinical Context & Significance

Hemodilution is a deliberate practice in cardiopulmonary bypass (CPB) where the patient's blood is diluted with the non-hemic priming volume of the extracorporeal circuit. This process results in a decrease in hematocrit and hemoglobin concentration, which has both physiological advantages and risks.

Physiological Benefits

Decreased blood viscosity, improving microcirculatory flow.
Reduced peripheral resistance, aiding tissue perfusion.
Decreased risk of thromboembolic complications.
Improved flow during hypothermia as viscosity naturally increases with cold.

Critical Thresholds

While hemodilution is beneficial, extreme dilution can impair oxygen-carrying capacity. Most clinical protocols target a hematocrit of 21-25% during normothermic bypass, although higher levels may be required for specific patient populations or deep hypothermic cases.

Reference: Gravlee's Cardiopulmonary Bypass: Principles and Practice. The formula used here follows the standard mass balance equation: (C1 * V1) + (C2 * V2) = C3 * V3.

Medical Disclaimer

This application is intended for educational and reference purposes for qualified perfusionists and cardiac surgical professionals. The clinical information and calculations provided should not substitute for professional clinical judgment or institutional protocols. Always verify results with independent calculations and equipment. Perfi does not assume liability for clinical decisions made based on this software.