No, it's AB-
Officially, there are 8 different types of blood but it is close since there are positive and negative versions of blood types A,B,AB, and O. But the least common type would be blood type AB-.
The least common blood type is type O negative. So she was on the right track. Both are very rare as most are A or AB positive or negative. Hopefully you can clear it up for her
ABO blood typing is a method for differentiating individuals' blood based on the presence or absence of two antigens, A and B. The most common blood type in the world is O positive, which has neither the A nor the B antigen.
O positive is a very common blood type. It is the most common blood type today. There are not many people with O negative. O negative is very rare.
A-negative blood type is relatively rare in the general population, with only about 6 of people having this blood type.
There are negative and positive of A, B, AB, and O. That means that there are 8 different blood types. Your blood type is determined based upon your mother and fathers blood types. O negative is the rarest blood type.
There are 30 human blood group systems that are recognised. In the commonly used ABO and Rh system the blood type AB- is the least common with never more than 1% of the population of a country having this type of blood.
The most common type of white blood cells are called Basophils
AB-
AB- 1%In the UK the ABO type that is most common is O, AB is least common and A is more common than B. However it is more common to be RhD +ve, hence O+ is the most common blood group in the UK, but the order of common blood types will vary depending on where a given person is from.
The most common blood types are A, B, and O. Type O is the most common, followed by type A, then type B. Type AB is the least common blood type.
If a child does not have the same blood type as either the father or the mother there is nothing to worry about. It is fairly common for a child to have a blood type that combines the blood types of the parents, such as an AB negative child whose parents had A negative and B negative blood.