A blood group (blood typing) test tells you which ABO group (A, B, AB or O) and Rh type (positive or negative) you have. It is essential before transfusions, surgery and during pregnancy.
| Measure | Range |
|---|---|
| ABO groups | A, B, AB or O |
| Rh factor | Positive or negative |
| Universal donor (red cells) | O negative |
| Universal recipient | AB positive |
No. Your ABO and Rh type are determined by your genes and stay the same throughout life (rare exceptions occur after certain bone-marrow transplants).
If the mother is Rh-negative and the baby is Rh-positive, the mother’s body can react against the baby’s blood. A protective injection (anti-D) prevents problems, so testing early matters.
O-negative red cells can be given to almost anyone in an emergency, which is why O-negative donors are always in demand.
Reviewed by Dr. Sanjay Anbu, MBBS. MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.