O positive blood can donate red blood cells to anyone with an Rh‑positive blood type: O+ , A+ , B+ , and AB+.

Quick Scoop: O+ Donation

  • O+ is compatible with all Rh‑positive blood types. That means your red cell donation can safely go to:
    • O+
    • A+
    • B+
    • AB+
  • O+ cannot donate to any Rh‑negative type (O−, A−, B−, AB−) because of the Rh factor difference.

Why O+ Is So Useful

  • A large majority of people are Rh positive, so O+ donations can be used for roughly three‑quarters of the population in many countries.
  • In emergencies, O+ is often used for Rh‑positive patients when exact matching by ABO type would take too long, as it is widely compatible on the Rh‑positive side.

Simple Rule to Remember

  • If the recipient’s type ends with a “+” , O+ red cells are generally eligible (O+, A+, B+, AB+).
  • If the recipient’s type ends with a “−” , O+ is not used because of the risk of an Rh reaction.

TL;DR:
O positive can donate to O+, A+, B+, and AB+ — but not to any negative (Rh−) blood types.

Information gathered from public forums or data available on the internet and portrayed here.