Is Rh-negative type O very rare?

Rh-negative O blood type is very rare.

Currently, the ABO and Rh systems are the most commonly used in clinical practice. The ABO blood group is determined by the presence of A and B antigens: individuals with A antigen are blood type A; those with B antigen are type B; those with both A and B antigens are type AB; and those lacking both A and B antigens are type O.

The Rh blood group system classifies blood based on whether red blood cells carry the D antigen—those with the D antigen are Rh-positive, while those without it are Rh-negative. Because Rh-negative blood is relatively rare—comparable to the rarity of giant pandas—O-type Rh-negative blood is generally considered extremely uncommon.

Since Rh-negative O blood is a rare blood type, individuals with this type should take special precautions in daily life to minimize significant blood loss, as finding compatible rare blood types quickly can be extremely difficult. This situation can also impact women's reproductive health; incompatible blood types may easily lead to miscarriage, premature birth, or even fetal death.

In everyday life, it is recommended to avoid strenuous activities that could lead to bleeding, and to refrain from regular blood donation.