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ABO Blood Compatibility — NCLEX Cheat Sheet

O- universal donor

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👤 By the CinnaRN Clinical Content Team 🕐 Updated 2026-07-11 🏷️ Safety & Infection Control 🔖 Free to read, print, and share

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Use this quick-reference guide to spot, treat, and prevent ABO Blood Compatibility on the NCLEX. Keep it handy during review and on exam day!

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Nursing actions

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Key facts

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Nursing actions

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Nursing actions

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Type O negative red cells are the universal donor and are used in emergencies before typing.

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