What happen if blood type B is mixed with A.?

When blood type B is mixed with blood type A, a blood transfusion reaction can occur. This is because the plasma of blood type B contains anti-A antibodies, while the plasma of blood type A contains anti-B antibodies. If these antibodies come into contact with the corresponding antigens on the red blood cells, they will cause the red blood cells to agglutinate (clump together). This can lead to blockages in the blood vessels and can cause serious health problems.

For this reason, it is important to ensure that blood transfusions are only given between compatible blood types. Blood type compatibility is determined by testing the patient's blood to see which antigens are present on the red blood cells. This information is then used to select a donor whose blood does not contain antibodies against the patient's antigens.

In the case of a blood transfusion reaction, the patient may experience a number of symptoms, including fever, chills, nausea, vomiting, and shortness of breath. In severe cases, a blood transfusion reaction can lead to kidney failure, heart failure, and even death.