Question

how we can do blood crossing?

Answer 1

Blood typing reveals what type of blood you have. This depends on the presence of certain antigens on your red blood cells (RBCs). Antigens are proteins that trigger your immune system to produce antibodies. There are four main types of blood:

type A blood, which contains type-A antigens
type B blood, which contains type-B antigens
type AB blood, which contains type-A and type-B antigens
type O blood, which contains neither type-A nor type-B antigens
Your blood will also be classified as Rh positive (+) or Rh negative (-), based on the presence or absence of a particular protein on your RBCs, known as rhesus factor.

Crossmatching is a test used to check for harmful interactions between your blood and specific donor blood or organs. It can help your doctor predict how your body will react to those donor materials.