Clue: Common blood type, briefly

Answer: APOS

Length: 4

---

Similar Clues:

• Blood type, briefly (e.g. APOS with 4 letters)
• Second-commonest blood type: Abbr. (APOS with 4 letters)
• Uncommon blood type, briefly (e.g. BNEG with 4 letters)
• Certain blood type, briefly (e.g. ONEG with 4 letters)
• Universal donor's blood type, briefly (ONEG with 4 letters)
• Universal donor blood type, briefly (ONEG with 4 letters)
• Blood type of a universal donor, briefly (ONEG with 4 letters)
• Blood type letters (ABO with 3 letters)
• Blood-type letters (ABO with 3 letters)
• Blood type system (ABO with 3 letters)