A member asked:

Could someone donate blood not knowing whether or not they have aids or other diseases?

A doctor has provided 1 answer
Dr. Donald Alves answered

Specializes in Emergency Medicine

Once: Yes, as many of the infectious diseases, like HIV and hepatitis, can be present without symptoms for a variable period of time in a person. This is why donated blood is tested thoroughly in the us to assure a safe blood supply. The risk of getting such a disease from a unit of blood is less than 1:250, 000 units transfused (at last update).

Answered 6/10/2014

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