What are the disadvantages of O negative blood?

O negative blood has disadvantages such as limited availability and risk during transfusion if mismatched.

• People with O negative can only receive O negative blood.
• It is rare (only about 7% of the population), so emergency supply can be low.
• Pregnant women with O negative blood risk Rh incompatibility if the fetus has a positive blood type.
• O negative donors must take care while donating frequently to maintain health.

Though O negative is called the universal donor type, its scarcity makes it medically valuable and critical in emergencies.