what is the rarest blood type in the world
The rarest blood type in the world is called Rh-null , often nicknamed “golden blood.” This type is so rare that only around 40–50 people on the planet are known to have it.
Quick Scoop: Short Answer
- Rarest in the world: Rh-null (“golden blood”)
- How rare? Fewer than 50 known people worldwide
- Rarest among the “usual” 8 types (A/B/AB/O, ±): AB negative
What Is Rh-null (Golden Blood)?
Rh-null is an ultra-rare blood type where the red blood cells completely lack all Rh antigens, which are usually present in most people’s blood. This absence makes Rh-null biologically unique and medically precious because it can sometimes be used for people with other rare Rh-related blood types who have trouble finding a match.
Because of its extreme rarity, Rh-null has been called “golden blood” —not for its color, but for how valuable it is in specialized transfusions and research.
How Rare Is It Really?
- Estimates suggest fewer than 50 people worldwide have Rh-null blood. Some reports mention under 50 documented cases ever.
- One in roughly 6 million people may have it, making it dramatically rarer than any common or even “rare” ABO/Rh type.
- For comparison, AB negative , the rarest of the familiar eight types (A, B, AB, O with +/−), is found in well under 1% of the population.
Because there are so few donors, Rh-null blood is often frozen and carefully tracked internationally.
Why Is It Such a Big Deal?
From a medical perspective, Rh-null acts as a kind of “universal donor” within the Rh system for patients with other rare Rh antigen patterns. This makes it hugely important when someone with a very unusual Rh profile needs a transfusion.
However, people with Rh-null face serious challenges:
- They can usually only receive blood from another Rh-null donor, which is extremely difficult to find.
- Rh-null red cells can be more fragile, which may predispose a person to certain forms of anemia and related health issues.
So it’s both a medical “treasure” and a personal vulnerability.
What About “Rarest Blood Type in the World” vs Everyday Types?
When people ask “what is the rarest blood type in the world,” they often mean within the standard 8 types seen on donation posters. In that everyday sense:
- Rarest common-type blood: AB negative (AB−).
- Truly rarest overall: Rh-null, which sits outside the usual ABO chart and is far rarer than AB−.
There are also other rare phenotypes like the Bombay (hh) group , which is extremely uncommon in the general population but more frequently discussed in certain regions such as India.
Why Is This a Trending Topic?
Rh-null often becomes a “trending topic” because:
- Headlines highlight that “only about 50 people have it” , which captures attention.
- It’s sometimes featured in documentaries, health blogs, and even fictional stories about “golden blood” being hunted or protected, blurring science and storytelling for readers.
- Ongoing research is exploring whether lab-grown Rh-null cells could one day help save patients with very rare blood profiles, adding a futuristic angle to the discussion.
Information gathered from public forums or data available on the internet and portrayed here.