| Clue | Source | Date |
|---|---|---|
| Rare blood type | New York Times | 09 Feb 2022 |
| Type least likely to turn up in a hospital | New York Times | 19 Jul 2019 |
| Type least likely to turn up in a hospital | ||
| Rare blood type | New York Times | 20 Nov 2017 |
| Rare blood type | ||
| Uncommon blood type | ||
| Rare type, and a hint to 17-, 25-, 38-, and 54-Across |