How many blood types are there?

There are 4 different blood types (A, B, O, & AB). Each blood type can either be Rh positive or Rh negative. (e.g., A+, A-, B+, B-, O+, O-, AB+, AB-).

Blood type AB is the universal receiver when it comes to donating blood. That means anyone can donate blood to a person with AB blood.

Blood type O is the universal donor, which means that anyone can take O blood. '

All other blood types can only be donated to their specific blood type (i.e. A-A, B-B.)
A B AB O, each of which can be positive or negative, for a total of eight.
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How many blood types do humans have?

Humans have 8 blood types: A+ and A- B+ and B- AB+ and AB- O+ and O- all types can receive donations from their individual blood type (for example anyone with A+ can (MORE)

How many types of human blood are there?

There are ten, in order from most common to most rare: O+ O- A+ A- B+ B- AB+ AB-. O+ is the most common with AB- being the rarest
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