A man whose blood group is not known meets with a serious accident and needs blood transfusion immediately, which one of the blood groups readily available in the hospital will be safe for transfusion?
(a) O, Rh–
(b) O, Rh+
(c) AB, Rh–
(d) AB, Rh+
(b) O, Rh+
Explanation:
According to ABO system of blood grouping, O type blood can be given to person of all types of blood, i.e., O, A, B and AB. Hence, a person with O type blood is called universal donor.
According to Rh system of blood grouping, most of the people have blood in which there is a substance called Rh factor. Rh stands for rhesus. This type of blood can be donated only in rarest of rare chances. In India, about 97% of people are Rh+. So, if an Rh+ person is transfused with Rh+ blood, then it is safe. But if an Rh negative (Rh–) person is transfused with Rh+ blood then he/she will develop antiRh factor i.e., antibodies in his/her blood, and there might beno harm is, but may kill the recipient if a second Rh+ transfusion is done.