| Blood Type | Can Donate To | Can Receive From | Population |
|---|---|---|---|
| O- | All (Universal Donor) | O- | 7% |
| O+ | O+, A+, B+, AB+ | O-, O+ | 38% |
| A- | A-, A+, AB-, AB+ | O-, A- | 6% |
| A+ | A+, AB+ | O-, O+, A-, A+ | 34% |
| B- | B-, B+, AB-, AB+ | O-, B- | 2% |
| B+ | B+, AB+ | O-, O+, B-, B+ | 9% |
| AB- | AB-, AB+ | O-, A-, B-, AB- | 1% |
| AB+ | AB+ | All (Universal Recipient) | 3% |
Check Blood Type Compatibility for Donation, Transfusion, and Pregnancy
Blood type compatibility decides whether one person's blood can be safely given to another, because mismatched red blood cells can trigger a dangerous immune reaction. This checker covers all 8 ABO and Rh types so you can see who can donate to whom, find compatible donors, and assess Rh factor risk for expecting parents.
Pick a type and the answer appears instantly across three modes: Donation (will your blood work for a chosen recipient), Transfusion (which donors are safe for you), and Pregnancy (Rh risk plus the possible blood types of the baby). A built-in chart and population data give you the full picture, with O- flagged as the universal donor and AB+ as the universal recipient.
Private by design: every check runs entirely in your browser. No blood type selections or results are ever sent to a server.
Educational use only: this tool reflects standard ABO and Rh rules, not laboratory crossmatching. Always consult a qualified healthcare professional before any donation, transfusion, or pregnancy decision.
How to Use the Blood Type Compatibility Checker
Three modes share the same set of 8 blood type buttons. Switch between them with the tabs at the top of the app.
1
Donation mode
Select Your Blood Type (Donor) to see every type you can give to and receive from. Add a Recipient's Blood Type and the result card instantly shows whether that specific match is compatible.
2
Transfusion mode
Select Your Blood Type (Recipient) and the app lists all compatible donors, highlights the universal donor O-, and shows each type's approximate share of the population.
3
Pregnancy mode
Pick the Mother's Blood Type and the Father's Blood Type. The app checks for Rh incompatibility and lists every blood type the baby could inherit.
4
Open the full chart
Tap View Full Compatibility Chart to expand a reference table covering donation and reception for all 8 types, with population percentages.
Features
Instant Donation Check
Select a donor and an optional recipient to see at once whether the donation is compatible, plus everyone the donor can give to and receive from.
Compatible Donor Finder
Transfusion mode lists every safe donor for your type and marks the universal donor, so you know exactly who can give to you.
Pregnancy Rh Assessment
Enter both parents to flag Rh incompatibility risk when an Rh- mother and Rh+ father could lead to hemolytic disease, with a note to consult your doctor.
Possible Baby Blood Types
Using ABO inheritance rules, the tool combines both parents' groups and Rh factors to list every blood type the baby may have.
Population Percentages
Each compatible donor is shown with its approximate share of the global population, so you can gauge how common each type is.
Full Compatibility Chart
A collapsible table covers all 8 blood types with their donation and reception lists, clearly marking the universal donor O- and universal recipient AB+.
All 8 Blood Types
A+, A-, B+, B-, AB+, AB-, O+, and O- are supported across every mode using standard ABO and Rh grouping.
Private and Offline-friendly
Every calculation happens locally in your browser, with a clear medical disclaimer for responsible, educational use.
Frequently Asked Questions
Which blood type is the universal donor?
O- (O negative) is the universal donor for red blood cells. O- can be transfused to a patient of any blood type, which makes it invaluable in emergencies when there is no time to determine the patient's type.
Which blood type is the universal recipient?
AB+ (AB positive) is the universal recipient. AB+ individuals carry both A and B antigens and the Rh factor, so their immune system accepts red blood cells from all 8 blood types.
Who can O+ donate to and receive from?
O+ can donate red blood cells to O+, A+, B+, and AB+ — the four Rh-positive types. O+ can receive from O- and O+ only. Select O+ in any mode to see this laid out instantly.
Can A and B parents have an O baby?
Yes. If an A parent and a B parent each carry a recessive O allele, the baby's ABO group can be A, B, AB, or O. Pregnancy mode applies these inheritance rules and lists all possible baby blood types for any parent combination.
Does the Rh factor affect compatibility?
Yes. An Rh-negative person lacks the Rh antigen, so receiving Rh-positive blood (such as O- receiving O+) can prompt their immune system to make anti-Rh antibodies, risking a severe reaction on later exposure. In pregnancy, an Rh- mother with an Rh+ father may face Rh incompatibility if the baby inherits Rh+, which the tool flags.
What blood type can I receive in a transfusion?
Open Transfusion mode and select your blood type. The app lists every compatible donor type, highlights the universal donor O-, and shows each type's approximate share of the population so you can judge availability.
Is this tool medically accurate, and does it store my data?
The compatibility data follows standard ABO and Rh grouping rules used in clinical practice, but real transfusions also require crossmatching and antibody screening in a laboratory, so use this as an educational reference only. All calculations run in your browser — no blood type data or results are sent anywhere.
No comments yet. Be the first to comment!