Blood Type Compatibility Checker
Check blood donation compatibility & Rh factor pregnancy risk
Blood Donation Compatibility Check
Donor Blood Type:
Recipient Blood Type:
Frequently Asked Questions
The universal donor is someone with O- (O negative) blood because they can donate to all eight blood types without the recipient's immune system rejecting it. The universal recipient is someone with AB+ (AB positive) blood because they can receive blood from all types. In emergencies when there is no time to determine the patient's blood type, O- blood is used as a safe option.
The Rh factor is a protein on the surface of red blood cells. If present, the blood type is positive (+); if absent, it is negative (-). Its importance in pregnancy arises when the mother is Rh- and the father is Rh+, as the fetus may inherit the positive factor. The mother's body may then produce antibodies that attack the fetal blood, causing Hemolytic Disease of the Newborn (HDN). This can be prevented with a RhoGAM injection.
No, that is not possible. A+ blood can only donate to A+ and AB+. B+ blood can only receive from B+, B-, O+, and O-. Transfusing incompatible blood causes a serious immune reaction that can be life-threatening. This is why hospitals perform cross-matching tests before every blood transfusion.
Men can donate blood every 56 days (8 weeks) and women every 84 days (12 weeks). The donor must be between 18-65 years old and weigh at least 50 kg. The body replenishes plasma within 24-48 hours and red blood cells within 4-8 weeks. In Saudi Arabia, blood donation does not invalidate fasting according to the Council of Senior Scholars' fatwa.
Globally, O+ is the most common (about 38%) and AB- is the rarest (less than 1%). In Saudi Arabia, O+ makes up 33%, A+ about 31%, B+ about 21%. Negative types are less common: O- about 4%, A- about 2%, B- about 1.5%, and AB- only about 0.5%. This is why people with negative blood types are in high demand for donation.
Not at all. Rh incompatibility between partners does not prevent having children. The first pregnancy is usually unaffected. Subsequent pregnancies can be protected with a RhoGAM injection given at week 28 of pregnancy and after delivery. The success rate of this preventive treatment exceeds 99%. The key is regular follow-up with an OB/GYN specialist.