How to Determine Your Blood Type

Two Methods:Visiting a Health Care ProviderLearning Your Blood Type in Other Ways

You might need to know your blood type for medical reasons, to get an international visa, or to just learn more about your own body. You can guess at your blood type based on your parents' blood type, but to be absolutely sure you've got to take a blood type test. Read on to learn about the different ways you can procure one and find out your blood type.

Method 1
Visiting a Health Care Provider

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    Ask your primary healthcare physician for your blood type. If your physician already has your blood type on file, then you just need to ask. However, they will only have your record on file if you've already had your blood drawn and/or tested. Common reasons why you may have already had your blood type tested include:[1]
    • pregnancy
    • surgery
    • organ donation
    • blood transfusion
  2. 2
    Request a blood test. If your type isn't on file, then you can also ask to get a blood test done. Call or visit your doctor's office and ask for a blood test to determine your blood type.
    • Try saying something like, "I want to find out what my blood type is. Would it be possible for the doctor to order a blood test to check my blood type?"
  3. 3
    Visit a health clinic. If you don't have a primary care physician, then you can have a blood test done at a health clinic. Just visit a local health clinic and ask them to test your blood type.
    • You may want to call ahead first to see if this is something that the health clinic offers.

Method 2
Learning Your Blood Type in Other Ways

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    Donate blood. This is an easy way to determine your blood type and help other people, all at once! Find a local donation center or wait until your school, church or community center hosts a blood drive. When you go in, ask the staff if they can tell you your blood type when you're done.
    • They may not be able to tell you right away, because your blood will need to be processed. Ask them to call you in a few days to let you know.
    • You might want to call ahead to make sure they'll give you your blood type before you choose a place to donate.
    • Keep in mind that there are some special eligibility requirements that you will have to meet before you can donate blood. There are also some things that may prevent you from donating, such as high risk behavior, travel to a foreign country, illness, or previous treatment of chronic illness.[2]
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    Go to a blood service center in your country of residence. Blood service centers usually provide people with free resources for getting their blood tested and finding out their type.
    • In Canada, go to onto Canada's official blood website. Find out where the next "What's Your Type?" event is taking place. These are regular promotional events hosted in the community by Canadian Blood Services. Your results are instant and you will find out how common or rare your blood type is, who you can receive from, and who you can donate to. You will learn both your ABO blood group, as well as your positive or negative Rhesus factor.
  3. Image titled Determine Your Blood Type Step 5
    Find a blood type calculator online. There are blood type calculators that can be found on several websites and will help you determine your possible blood type. To use them, you need to know your parents' blood types.[3]Here are the possible blood type combinations and the types they produce: [4]
    • 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


  • In addition to the blood types, one should also have their Rh or Rhesus factor tested. If you have your blood typed by the Red Cross or any other professional organization, they'll tell you the Rh factor. This is sometimes called D. You are either D+ or D-. For example, if clumping was noticed in the A field, and in the D field, then that person is A+ blood type.

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