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Uses simplified transfusion rules: recipient ABO and Rh must accept donor ABO and Rh. Does not cover rare antigens, plasma rules, or neonatal protocols.
Quick answer: Blood Type Compatibility (Red Cells)
ABO plus Rh gatekeeping for red cells only - O neg still goes through the blood bank, not your living room.
Example: O+ donor to AB+ recipient passes the toy model; real life still needs type-screen and crossmatch.
Calculations follow the documented formula on this page; rounding and input units can change the last digit-treat outputs as educational estimates unless you reconcile with source systems.
* This is an estimate. Actual amounts may vary slightly based on input assumptions.
Kell, Kidd, Duffy, and warm autoantibodies make textbook grids laughable; compatibility is an immunohematology lab outcome.
Uses simplified transfusion rules: recipient ABO and Rh must accept donor ABO and Rh. Does not cover rare antigens, plasma rules, or neonatal protocols.
Inputs on this page: Recipient ABO type, Recipient Rh, Donor ABO type, Donor Rh. Assumptions stay visible so you can reproduce the figure elsewhere.
Long-form walkthroughs that pair well with this calculator. When you need narrative context beyond the live fields, start here and return to the tool to plug in your own numbers.
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Read guide →People who care about blood type compatibility calculator use Blood Type Compatibility (Red Cells) as a planning sandbox: Plasma compatibility runs opposite - never use this for FFP decisions.
Continue in the Calculators category hub, the Utility tools collection, or the glossary. Related calculators in this session: Age Calculator, Daily Calorie Calculator, Anxiety Level Self-Assessment (GAD-7 style), Life Expectancy Calculator, BMI for Children Calculator, Percentage Calculator.
The Formula
ABO: O→O only; A←A/O; B←B/O; AB←any; Rh− recipient accepts Rh− donor only (red cells, simplified)| This tool | ABO: O→O only; A←A/O; B←B/O; AB←any; Rh− recipient accepts Rh− donor only (red cells, simplified) |
|---|---|
| Related intent: blood type compatibility calculator | See paired tools for blood type compatibility calculator-each page documents its own core relationship next to the live form. |
| Related intent: abo rh transfusion compatibility | See paired tools for abo rh transfusion compatibility-each page documents its own core relationship next to the live form. |
Core relationship for Blood Type Compatibility (Red Cells):
ABO: O→O only; A←A/O; B←B/O; AB←any; Rh− recipient accepts Rh− donor only (red cells, simplified)
Worked check: O+ donor to AB+ recipient passes the toy model; real life still needs type-screen and crossmatch.
Keep the same assumptions and open a neighbor calculator when your question branches: Age Calculator, Daily Calorie Calculator, Anxiety Level Self-Assessment (GAD-7 style), Life Expectancy Calculator. Each page documents its own formula beside the fields.
Learning links: Methodology · Editorial policy · Glossary
O+ donor to AB+ recipient passes the toy model; real life still needs type-screen and crossmatch.
Re-enter the same numbers in the calculator above to confirm the page math matches the interactive result.
People who care about blood type compatibility calculator use Blood Type Compatibility (Red Cells) as a planning sandbox: Plasma compatibility runs opposite - never use this for FFP decisions.
Instant response
Run Blood Type Compatibility (Red Cells) in the browser and read the breakdown beside the form.
Transparent formula
The formula and worked example on this page match what the calculator uses.
Privacy friendly
No account required; inputs stay in your session unless you choose to share them.
Cross-device ready
Layout works on mobile, tablet, and desktop for the same field labels.
Official references for context. Calculator outputs are planning estimates—confirm material decisions with the primary authority or a qualified professional. See our methodology and editorial policy.
Reviewed July 18, 2026 · Content stamp 2026-07-18
Click a question to expand the answer.
No. Antibody screens, crossmatches, and special products are mandatory in real care.
Plasma rules are reversed vs red cells - this tool is red-cell donation only.
Generally not for red cell transfusion to an Rh− recipient in this simplified model.
O Rh− red cells are often called universal donors for red cells; clinical policy still applies.
Special rules exist - never use this calculator for those cases.
ABO plus Rh gatekeeping for red cells only - O neg still goes through the blood bank, not your living room.
O+ donor to AB+ recipient passes the toy model; real life still needs type-screen and crossmatch.
Plasma compatibility runs opposite - never use this for FFP decisions. Massive transfusion protocols may switch group-specific products under physician orders. Neonatal exchange transfusion uses specialized O Rh-negative units with extra testing.
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Reviewed by Toollabz Editorial
Product editor | Last reviewed July 18, 2026
See methodology and editorial policy.