Blood type tests are done before a person gets a blood transfusion and to check a pregnant woman's blood type. The following table shows the compatibility of blood types between blood donors and recipients. Read the table as follows: A person who has A-negative blood can receive A-negative or O-negative blood.
http://www.webmd.com/a-to-z-guides/blood-type-test
Knowing one’s blood type is important for everyone. Having received a blood type test (ABO grouping and RH typing) can save valuable time in the event that you need to know your blood type for medical reasons. Serious health complications can result when a pregnant woman had a different blood type than her baby.
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Test Overview. Blood type tests are done before a person gets a blood transfusion and to check a pregnant woman's blood type. Human blood is typed by certain markers (called antigens) on the surface of red blood cells. Blood type may also be done to see if two people are likely to be blood relatives.
http://www.webmd.com/a-to-z-guides/blood-type-test
The blood type and Rh factor are then interpreted by matching the test results from the Eldoncard with the result chart. For example, using the color chart provided on the left, coagulation is seen in cells one and three on the test card.
http://www.craigmedical.com/Blood_typing_kit.htm
When to get a Blood Type Test (ABO Grouping and RH Typing) A blood type test (ABO grouping and RH typing) should always be performed before a person receives a blood transfusion, donates blood, donates an organ for transplant, or undergoes surgery.
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Blood types are based on the markers (specific carbohydrates or proteins) or antigens on the surface of red blood cells (RBCs). Two major antigens or surface identifiers on human RBCs are the A and B antigens. Another important surface antigen is called Rh. Blood typing detects the presence or absence of these antigens to determine a person's ABO blood group and Rh type.
https://labtestsonline.org/understanding/analytes/blood-typing/tab/sample
Blood typing is determined by the type of antigens or markers that are on the surface of red blood cells (either A or B) and if there are antibodies to a portion of the blood type known as the Rh factor (either positive or negative).
http://www.craigmedical.com/Blood_typing_kit.htm
A person's blood type is determined largely by genetics, and it does not change through his or her lifetime. A simple blood typing test can be performed literally anywhere by anyone through the use of specially-treated testing cards. One of the main factors that determines blood type is family genetics.
http://www.wisegeekhealth.com/what-determines-what-blood-type-a-person-has.htm
The blood type test (ABO grouping and RH Typing) typically sees results in 1-2 business days. You will be notified by e-mail as soon as your results are available. You can access your results online or call to speak to a representative. Results can also be sent by fax or mail by special request.
https://requestatest.com/how-do-i-find-out-blood-type-blood-type-test
It is recommended that all pregnant woman and those who need a blood transfusion should determine blood type via a blood type kit, especially the Rh factor. All donated blood has a blood type test performed on it so that donor and recipient blood types match.
http://www.craigmedical.com/Blood_typing_kit.htm
what test determines blood type
ABO grouping and Rhesus typing test determines the type of blood.