According to Japanese Red Cross Society, the most common ABO blood type in Japan is type A (40%).
The following shows the percentage of "ABO & Rh" blood types in Japan. (unit: %)
The ratio is approximately A:O:B:AB = 4:3:2:1
| Type | Type | % |
| A | Rh minus | 0.20 |
| A | Rh plus | 39.80 |
| O | Rh minus | 0.15 |
| O | Rh plus | 29.90 |
| B | Rh minus | 0.10 |
| B | Rh plus | 19.90 |
| AB | Rh minus | 0.05 |
| AB | Rh plus | 9.90 |
Source is Japanese Red Cross Society.
www.jrc.or.jp/donation/first/knowledge/
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