Forward Grouping

Forward blood typing, also called forward grouping, is a laboratory test used to determine a person’s blood type by identifying which antigens are present on their red blood cells. In this test, a sample of blood is mixed with antiserum containing known antibodies, such as anti-A serum and anti-B serum.

If agglutination occurs when the blood is mixed with anti-A serum, the sample contains A antigens. If agglutination occurs with anti-B serum, the blood contains B antigens.

Reverse Grouping

Reverse blood typing, also known as reverse grouping, determines blood type by identifying the antibodies present in the plasma. In this test, the plasma from the blood sample is mixed with known red blood cells containing A or B antigens.

If agglutination occurs when plasma is mixed with Type A cells, the plasma contains anti-A antibodies. By examining which reactions occur, scientists can confirm the blood type determined through forward grouping.

Using both forward and reverse typing ensures accurate blood classification and reduces the risk of transfusion errors.