How to Find Out Your Blood Type

We include products we think are utilitarian for our readers. If you buy through links on this page, we may earn a small commission. here ’ s our process. Finding out your blood type is relatively simple. You can :

  • have your doctor order a test
  • get the information when donating blood
  • take an at-home blood test

How do you determine your blood type?

Your blood type is comprised of two blood groups : ABO and Rh. Blood types are based on antigens on the surface of your loss rake cells. An antigen is a substance that triggers an immune response by your body against that meaning. The bearing of specific antigens designates ABO lineage types :

  • Type A has the A antigen
  • Type B has the B antigen
  • Type AB has both the A and B antigen
  • Type O has neither the A nor B antigen

once your ABO lineage type has been determined, it can be far defined by identifying the Rhesus ( Rh ) agent :

  • Rh-positive. If you have Rh antigens on the surface of your red blood cells, you have Rh-positive blood.
  • Rh-negative. If you don’t have Rh antigens on the surface of your red blood cells, you have Rh-negative blood.

By including the Rh factor, the 8 most prevailing lineage types can be identified : A+ or A-, B+ or B-, AB+ or AB-, and O+ or O-.

How is blood testing typically done?

A phlebotomist ( person trained to draw blood ) will use a phonograph needle to draw lineage from your weapon or hand at your doctor of the church ’ second agency, a clinical lab, or a hospital The distinctive method for typing blood involves two steps :

  • forward typing
  • reverse typing

Forward typing

The first dance step is called “ ahead typing. ” Your blood cells are shuffle with antibodies against type vitamin a and B blood, and the sample distribution is checked to see whether the blood cells stick together ( agglutinate ). If blood cells stick together, it means your blood cells reacted with one of the antibodies. For example, if your blood cells agglutinate when assorted with antibodies against type B blood ( “ anti-B antibodies ” ), you have type B rake .

Reverse typing

The second step is called “ back typing ” or “ reverse typing. ” The liquid function of your blood without loss rake cells ( serum ) is mix with blood cells that are known to be type A and type B. People with type A blood have antibodies against Type B lineage ( “ anti-B antibodies ” ) in their serum, and those with type B blood have antibodies against Type A blood ( “ anti-A antibodies ” ) in their serum. Type O blood contains both anti-A and anti-B antibodies. then, for example, if agglutination occurs when your serum is mix with type B rake cells, you have type A blood .

Summary and Rh typing

ABO testing should include both advancing and reverse type. The solution from forward typing is the patient ’ mho blood character. Reverse type is a cross-check for forward typing and provides ratification of results. next, your blood will be shuffle with an anti-Rh serum. If your blood cells answer by clumping together, you have rh-positive blood.

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How can I find out my blood type at home?

In at-home lineage type tests, they typically ask that you prick your finger with a lancet arch and put drops of your blood on a limited tease. After putting the blood on the card, you can observe the areas where lineage clumps or spreads out, and then match those reactions to an included scout. Some base testing kits have vials of fluid for your blood, as opposed to a calling card. Purchase an at-home blood typing kit here .

How to find out your blood type for free

One means to find out your blood type is to donate blood. If you donate to community blood supplies, ask the staff if they ’ ll be able to tell you your blood type. many contribution centers are able to provide that data. typically, you won ’ deoxythymidine monophosphate get your lineage type immediately and may have to wait a few weeks, as rake international relations and security network ’ t normally tested right away .

Can blood type be determined without drawing blood?

About 80 percentage of people secrete blood group antigens in other bodily fluids, such as saliva, mucus, and sweat. This group of people is referred to as secretors. Secretors can have their blood type determined by a saliva or other consistency fluid test. Blood typing kits using saliva are available on-line, but they ’ re typically more expensive. Using one of the kits, you ’ ll first memorize whether you ’ re a gland. If you are, then you ’ ll be able to determine you ABO blood type.


There are a number of ways you can determine your blood type, including :

  • visiting your doctor
  • going to a hospital or clinical laboratory that tests blood
  • donating blood
  • getting a home testing kit

If you ’ re in the category of people who secrete blood-group antigens in other body fluids, you may be able to find out your blood type without having blood trace .

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