Rhnull – The Rarest Blood Group in the World, Known as “Golden Blood”

The rarest blood group in the world is known as Rhnull, often called "golden blood." This blood type is unique because it completely lacks all Rh antigens on the surface of red blood cells, a feature that distinguishes it from all other blood types. While the familiar ABO system (A, B, AB, O) and the Rh factor (positive or negative) cover most people, Rhnull is extraordinarily rare—fewer than 50 people worldwide are known to have it.

Rhnull was first discovered in 1961 in an Aboriginal Australian woman. The absence of Rh antigens makes this blood type extremely valuable for transfusions to people with rare blood groups, as it can be accepted by almost anyone with a compatible ABO type. However, people with Rhnull blood can only receive transfusions from other Rhnull donors, making emergencies especially challenging.

For comparison, among the standard blood types, AB negative is the rarest, found in just about 1% of the population. Other rare types include the Bombay (hh) phenotype, which is also extremely uncommon, particularly in certain regions like India.

The rarity of Rhnull is due to genetic mutations, often inherited through families, especially where close relatives marry (consanguineous marriage). People with this blood type may face health issues, such as mild to moderate hemolytic anemia, due to the lack of Rh antigens that help maintain red blood cell structure.

In summary, while AB negative is the rarest among the common blood types, Rhnull or "golden blood" is the rarest blood group in the world, with fewer than 50 known cases globally.

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1.What is the rarest blood group in the world?

   - A) AB negative  

   - B) O negative  

   - C) Rhnull  

   - D) Bombay (hh)  

   Answer:

2. Approximately how many people in the world have Rhnull blood?  

   - A) 1 in 1,000  

   - B) 1 in 100,000  

   - C) 1 in 6 million  

   - D) 1 in 100 million  

   Answer:

3.What is another name for Rhnull blood?  

   - A) Golden blood  

   - B) Silver blood  

   - C) Universal donor  

   - D) Bombay blood  

   Answer:

4. Which blood type is the rarest among the standard ABO and Rh groups?  

   - A) O positive  

   - B) AB negative  

   - C) A positive  

   - D) B negative  

   Answer:

5.Why is Rhnull blood so valuable for transfusions?

   - A) It can be given to anyone regardless of blood type  

   - B) It is easy to find  

   - C) It contains extra antigens  

   - D) It is only found in children  

   Answer: