What are some situations that blood typing would be used for?

* Blood transfusions. Blood typing is used to determine the compatibility of blood between donors and recipients. This is important to prevent transfusion reactions, which can occur when a recipient's immune system attacks the donor's blood.

* Organ transplants. Blood typing is also used to determine the compatibility of organs between donors and recipients. This is important to prevent rejection, which can occur when a recipient's immune system attacks the donor's organ.

* Paternity testing. Blood typing can be used to determine the paternity of a child. This is done by comparing the blood types of the child, mother, and alleged father.

* Forensic investigations. Blood typing can be used to identify blood at a crime scene. This can help to identify suspects and victims.

* Medical research. Blood typing is used in a variety of medical research studies, including studies on genetics, blood diseases, and immune system function.