You can usually find your blood type in a few different places, or have it checked quickly with a simple test. Medical organizations describe several standard options that are safe and reliable.

Easiest ways to find it

  • Ask your doctor or clinic if your blood type is already in your record from past lab work, surgery, pregnancy care, or a previous transfusion.
  • Donate blood: many blood donation centers will test and then tell you your blood type on your donor card or online account.
  • Get a basic blood test ordered by your doctor or at a lab; they can add “ABO and Rh typing” to your labs and report the result (for example, A+, O−).

At-home options

  • Use an at‑home blood typing kit: you prick your finger, place drops of blood on a special card, and compare the pattern of clumping to a chart to see your type.
  • Some specialized kits can determine blood group from saliva or other body fluids, but they work only for people who secrete blood group antigens and are usually more expensive.

What not to rely on

  • DNA/ancestry tests generally cannot reliably tell your exact blood type, so they are not a substitute for a proper blood typing test.
  • Family guesses (“everyone in my family is O+”) are not dependable; siblings and parents can have different blood types, so a direct test is still needed.

Safety tip

  • For emergencies, hospitals always test your blood directly before transfusion, even if you think you know your type, because giving the wrong type can be dangerous.
  • If you get your blood typed, consider writing it down (for example on a medical ID, phone health app, or donor card) so you do not have to repeat the test later.

Information gathered from public forums or data available on the internet and portrayed here.