Red Cell Compatibility Calculator

Estimate the probability of finding compatible blood units based on patient antibodies.

Calculate Compatibility

Enter patient antibodies to estimate compatible donor availability

Donor Population Ancestry

Antigen frequencies vary by ancestry. Categories are approximations from published studies; individual variation exists within all populations.

Units Required:

Patient Antibodies (antigens to avoid)

Type and select antigens, or use quick-add buttons below

Quick Add - Common Antibodies:

Results

Estimated probability and screening requirements

Select antibodies to see compatibility results

Antigen-Negative Donor Frequency

Proportion of donors lacking every selected antigen

Estimated units to screen: --

Antigen-Negative Donor Frequency by Population

With a mixed donor base, expect availability somewhere within this range. The combined antigen-negative frequency accounts for linkage disequilibrium where applicable.

Antigen Breakdown

Antigen	System	European	African	East Asian	Clinical Significance

Data Sources

Important Notice