Do you know your blood type? Your blood type will always be checked if you ever find yourself in a life-threatening situation requiring a blood transfusion. Some blood kinds, out of the eight most prevalent, are more uncommon than others. Additionally, your blood type determines the type of blood you can get from a donor. A blood type is considered to be rare when it is only found in a small percentage of the population, says Jared Braunstein, DO, an internist at Medical Offices of Manhattan. Read the article.