There are four basic
blood types.
And their basic
relationships are as follows:
- Donating
- Type A can donate to A or AB
- Type B can donate to B or AB
- Type AB can donate to AB only
- Type O can donate to anyone
- Receiving
- A can receive from A or O
- B can receive from B or O
- Type AB can receive from anyone
- O can only receive from O
There is also an Rh factor attached to a blood type which is the + or -. The plus means there is protein present in your blood. A minus denotes a lack of protein. A person with a negative Rh factor can only receive negative type blood. Otherwise, there is a chemical interaction that could cause clumping, a stroke, and possibly death.