Question

Write the procedure followed by you to know your blood group

Answer 1

Ask your parents for their blood type. If your biological parents both know their blood type, that narrows down the possibilities. In most cases this is only enough to guess, using an online blood type calculator or the following list:[1]

Figuring Out Your Blood Type
O parent x O parent = O child
O parent x A parent = A or O child
O parent x B parent = B or O child
O parent x AB parent = A or B child
A parent x A parent = A or O child
A parent x B parent = A, B, AB or O child
A parent x AB parent = A, B or AB child
B parent x B parent = B or O child
B parent x AB parent = A, B or AB child
AB parent x AB parent = A, B or AB child
Blood types also include an "Rh factor" (+ or -). If both of your parents have an Rh- blood type (such as O- or AB-), you are also Rh-. If one or both of your parents are Rh+, you cannot tell whether you are + or - without a test.[2]

Answer 2

Figuring Out Your Blood Type

O parent x O parent = O child

O parent x A parent = A or O child

O parent x B parent = B or O child

O parent x AB parent = A or B child

A parent x A parent = A or O child

A parent x B parent = A, B, AB or O child

A parent x AB parent = A, B or AB child

B parent x B parent = B or O child

B parent x AB parent = A, B or AB child

AB parent x AB parent = A, B or AB child

Blood types also include an "Rh factor" (+ or -). If both of your parents have an Rh- blood type (such as O- or AB-), you are also Rh-. If one or both of your parents are Rh+, you cannot tell whether you are + or - without a test.