Why Is Type O Blood Called “Panda Blood”?

Blood type refers to the antigen types present on the surface of blood components—including red blood cells, white blood cells, and platelets. The most widely known blood group systems are the ABO system (comprising types A, B, O, and AB) and the Rh system. So why is type O blood sometimes called “panda blood”? Let’s explore this together.

Why Is Type O Blood Called “Panda Blood”?

1. What Is “Panda Blood”?

“Panda blood” refers specifically to Rh-negative blood—a rare and uncommon blood type, hence its nickname. Clinically, the Rh blood group system ranks second in importance after the ABO system. During Rh testing, individuals whose red blood cells agglutinate with anti-Rh(D) serum are classified as Rh-positive; those showing no agglutination are Rh-negative. In China, approximately 99.7% of the population is Rh-positive, while only about 0.3% is Rh-negative.

2. What Is Type O Blood?

Type O blood is one of the most common blood types—and also the earliest to have evolved in human history. It is characterized by the absence of both A and B antigens on the surface of red blood cells. Colloquially, type O blood is often referred to as the “universal donor” for red blood cell transfusions.

3. Type O Blood Is Not “Panda Blood”

Commonly referred to as “O-type,” type O blood is not synonymous with “panda blood.” The two primary blood group systems used in clinical practice are the ABO system and the Rh system. The ABO system comprises four blood types: A, B, O, and AB. The Rh system, meanwhile, classifies individuals as either Rh-positive or Rh-negative. “Panda blood” specifically denotes Rh-negative status—since over 95% of the general population is Rh-positive, Rh-negative individuals requiring transfusion pose a significant clinical challenge, necessitating advance preparation of compatible blood.

The above explains why type O blood is sometimes mistakenly called “panda blood.” We hope this information proves helpful.