Visit a hospital, clinic, or diagnostic lab
Ask for an ABO and Rh blood group test
Provide a blood sample
Wait for the lab result
Check your blood group on the report
Look for one of these types: A, B, AB, or O
Check whether it is Rh positive or Rh negative
Review old medical records or blood donation records
Check your blood donor card if you have one
Use a home blood typing kit if available
Confirm the result with a medical laboratory