Close up photo of female scientist holding a laboratory pipette and a blood sample tube for covid-19 in laboratory. She is wearing a protective suit, laboratory glasses, surgical mask and surgical ...

There are different blood types: A, B, AB, and O, with each also being Rh-positive or Rh-negative. Knowing your blood type is ...

O- blood is the universal donor type because it can be used for anyone. AB+ blood can receive any type of blood, making it the universal recipient. Blood types need to match, or the immune system will ...

My blood type is A negative. I’ve heard this can cause pregnancy issues, so I Googled “Rh-negative blood” and ran across a bunch of weirdo sites with “theories” about the origin of negative blood ...

One out of every eight marriages in the U.S. is a potentially dangerous mismatch, biochemically speaking. In these 200,000 or more marriages a year, the wife lacks the Rh factor present in most blood ...