Blood Types Explained: Compatibility, Universal Donor/Recipient & Myths

No blood type is "best." Each has transfusion compatibility profiles. The ABO system + Rh factor (positive/negative) determine safe matching.

ABO Compatibility (Red Blood Cells)

Recipient Type	Can Receive From	Can Donate To
O−	O−	All (universal donor)
O+	O−, O+	O+, A+, B+, AB+
A−	A−, O−	A−, A+, AB−, AB+
A+	A−, A+, O−, O+	A+, AB+
B−	B−, O−	B−, B+, AB−, AB+
B+	B−, B+, O−, O+	B+, AB+
AB−	A−, B−, AB−, O−	AB−, AB+
AB+	All (universal recipient)	AB+

Plasma Compatibility (Reverse)

• AB plasma = universal donor (no anti-A/B antibodies).
• O plasma = universal recipient (contains both anti-A & anti-B).

Rh Factor

• Rh− can receive only Rh−. Rh+ can receive Rh+ or Rh−.
• Rh− women in pregnancy: RhIg (RhoGAM) prevents sensitization.

Population Distribution (US Approx.)

• O+: 38%, O−: 7%, A+: 34%, A−: 6%, B+: 9%, B−: 2%, AB+: 3%, AB−: 1%

Myths Debunked

• ❌ Blood type diet: no scientific evidence.
• ❌ Blood type personality (Japan): cultural, not biological.
• ❌ "Rare blood = better": rare types (e.g., Rh-null) create transfusion challenges.

Donate blood! All types needed. Check eligibility at Red Cross or local blood center.