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Which blood types are compatible for donation and transfusion?

Pick your ABO/Rh blood type in AnyTool Blood Type Compatibility and it instantly shows who you can donate red cells to and receive red cells from, plus the reverse plasma picture. O− is the universal red-cell donor and AB+ the universal recipient; for plasma it flips, so AB is the universal plasma donor and O the universal plasma recipient. A second mode predicts a child’s possible blood types from both parents using a Punnett square. Everything runs in your browser, so nothing is uploaded — and it is educational only, never a substitute for laboratory crossmatching.

  • O− donates red cells to all 8 types; AB+ receives from all 8
  • Plasma is the reverse: AB is the universal plasma donor, O the recipient
  • Rh-negative cells suit any Rh; Rh-positive cells only go to Rh-positive
  • Inheritance mode lists every possible child type with its probability
  • 100% in your browser — no upload, educational only, not medical advice

What is

Blood type compatibility

Blood type compatibility describes which ABO/Rh blood groups can safely give and receive blood. For red cells the donor’s A, B and RhD antigens must all be tolerated by the recipient, making O− the universal donor and AB+ the universal recipient; for plasma the rule reverses because plasma carries the antibodies, so AB plasma suits everyone and O plasma only O. Blood type is inherited from two genes — ABO (A and B codominant, both dominant over O) and Rh (D dominant over d).

Calculators

Related terms

Universal donor (O−)Universal recipient (AB+)Rh factor (RhD)Blood type inheritance

Frequently Asked Questions

O negative is the universal red-cell donor and AB positive is the universal recipient.

O-negative red cells carry no A, B or RhD antigen, so they can be given to any of the eight blood types — that is the universal donor. AB-positive blood tolerates every antigen, so an AB-positive patient can receive red cells from anyone and is the universal recipient. For plasma the roles flip: AB plasma carries neither anti-A nor anti-B and is the universal plasma donor, while O can only receive plasma from O. AnyTool flags each of these automatically when you pick a type.

Yes — blood type comes from two genes, so a child can have a type neither parent shows.

ABO has three alleles (A and B are codominant and each dominant over O), and Rh has D dominant over d, so an A parent might secretly carry an O allele and an Rh-positive parent a hidden d. Two type-A parents who each carry O can have an O child, and two Rh-positive parents who each carry d can have an Rh-negative child. AnyTool’s inheritance mode runs the Punnett square and lists every possible child type with its probability.

Plasma carries antibodies instead of antigens, so the safe direction flips.

Red cells display A, B and RhD antigens, so a recipient must already tolerate any antigen the donor cells carry — which makes O the safest red-cell donor. Plasma instead carries the matching antibodies (anti-A, anti-B), so the donor plasma must not attack the recipient’s own antigens. AB plasma has neither antibody and suits everyone, while O plasma has both and can only go to O. AnyTool shows both the red-cell and plasma pictures side by side.

No — it is educational only; real transfusions need laboratory crossmatching.

This tool models only the ABO and RhD antigens, but real transfusions depend on crossmatching and dozens of other antigen systems (Kell, Duffy, Kidd and more), irregular antibodies and the patient’s history. The inheritance odds are the textbook Punnett model and ignore rare subgroups like the Bombay phenotype and non-paternity. Never use it for any medical, transfusion or paternity decision — consult a clinician or blood bank. Everything runs in your browser and nothing is uploaded.

Detailed Explanation

Methodology

How Blood Type Compatibility Is Determined

AnyTool models the ABO and RhD antigen systems in the browser. For a red-cell transfusion the donor cells’ antigens must be a subset of those the recipient tolerates: O− carries no A, B or RhD antigen and can go to all eight types (universal donor), while AB+ tolerates every antigen and can receive from all eight (universal recipient). Plasma compatibility is computed as the exact reverse, because plasma carries the antibodies (anti-A, anti-B) rather than the antigens — so AB plasma, which has neither antibody, is the universal plasma donor and O plasma can only go to O. Each rule is a pure set comparison in a unit-tested engine, with no server round-trip.

  • Red-cell rule: donor antigens must be a subset the recipient tolerates
  • O− is the universal red-cell donor; AB+ the universal recipient
  • Plasma reverses the rule: AB is universal plasma donor, O the recipient
  • Rh-positive cells only go to Rh-positive; Rh-negative suits any Rh
  • All eight ABO/Rh types computed client-side with no Calculate button
How It Works

Predicting a Child’s Blood Type

The inheritance mode crosses both parents’ blood types with a Punnett-square enumeration. ABO is a single gene with three alleles — A and B are codominant and each dominant over O — so a phenotype maps to more than one possible genotype (an A parent may be AA or AO). Rh is a separate gene with D dominant over d. The engine expands every genotype consistent with each parent’s blood type, crosses the ABO and Rh genes independently with equal weight, and aggregates the child phenotype probabilities, rounding them to whole percentages that still sum to 100. This explains results such as two type-A parents having an O child, or two Rh-positive parents having an Rh-negative child.

  • ABO: A and B codominant, both dominant over recessive O
  • Rh: D (positive) dominant over d (negative)
  • Each phenotype expands to all compatible genotypes with equal weight
  • ABO and Rh genes crossed independently, then combined
  • Two Rh-positive parents can still have an Rh-negative child
Limitations

Educational Only — Not a Substitute for Crossmatching

This tool covers only the ABO and RhD antigens, but a real transfusion requires laboratory crossmatching and accounts for dozens of other red-cell antigen systems (Kell, Duffy, Kidd, MNS and more), irregular antibodies, the component being transfused and the patient’s clinical history. The inheritance probabilities are the standard textbook model and ignore rare subgroups such as the Bombay phenotype and weak-D variants, as well as the possibility of non-paternity. AnyTool states these limits plainly: the result must never be used for any medical, transfusion or paternity decision, and a qualified clinician or blood bank should always be consulted.

  • Models only ABO and RhD — not Kell, Duffy, Kidd, MNS and others
  • Real transfusions need crossmatching and antibody screening
  • Inheritance ignores rare subgroups (e.g. Bombay) and non-paternity
  • Never use for medical, transfusion or paternity decisions
  • Presented as education, not clinical guidance
Privacy & Security

Privacy and Offline Use

Every compatibility lookup and inheritance calculation runs in the browser from a pure, unit-tested engine, so the blood types you select are never sent to a server, there is no account or tracking, and the page works offline after first load.

Blood type compatibility: in-browser (AnyTool) vs typical online charts
CapabilityAnyToolTypical online charts
ProcessingRuns in your browserOften server-side or static image
Red cellsDonor and recipient listsUsually one direction only
PlasmaReverse rule shown explicitlyFrequently omitted
Universal flagsDonor + recipient, both componentsOften red cells only
InheritancePunnett predictor with probabilitiesRarely included
HonestyStates ABO/Rh-only limits clearlyOften presented as definitive
Works offlineYes (PWA)No
Cost / signupFree, no signupOften ad-heavy or gated

AnyTool computes red-cell, plasma and inheritance results locally and uploads nothing.