In Singapore, most people are Rhesus positive (A+, B+, O+, AB+), and less than 1% of the population are Rhesus negative (A–, B–, O– and AB–).
Rhesus-negative blood is considered rare and precious because patients who have such blood are recommended to receive Rhesus-negative blood.
Share of the blood donor pool:
| Blood type | % of donor pool |
| O+ | 44.7% |
| B+ | 24.5% |
| A+ | 23.9% |
| AB+ | 5.6% |
| O– | 0.6% |
| A– | 0.3% |
| B– | 0.3% |
| AB– | 0.1% |