When Nick’s father went to give blood, he was tested for his blood type. Why?

Nick's father was tested for his blood type to determine his blood group and even to see if he is Rh-positive or Rh-negative.

Explanation: Unless he is a universal donor (someone with O+ blood), Nick's father won't be able to give his blood to anyone without knowing his blood type first. Giving someone the wrong blood type can be harmful to the receiver's immune system.

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