What is the rarest blood type?
- A. A Negative
- B. B Positive
- C. O Negative
- D. AB Negative
Show answer
Correct: D. AB Negative
AB negative (AB-) is the rarest blood type among the eight main blood types (A+, A-, B+, B-, AB+, AB-, O+, O-). It is found in less than 1% of the global population. This blood type is rare because it requires inheriting both A and B alleles from parents and also having the Rh-negative factor. AB negative individuals are called "universal plasma donors" because their plasma can be given to patients of any blood type.