The test determines your blood group: A, B, AB or O and your rhesus type (RH-positive or RH-negative).
The test identifies your blood group (A, B, AB, or O) and your rhesus type, either Rh-positive or Rh-negative.
The different blood groups and types come only from the different proteins and sugars that coat the red blood cells. Accordingly, AB positive (AB+) and O negative (O-) are considered universal blood types. People who are AB+ are universal recipients, meaning they can safely receive a blood transfusion using any other blood type. O- individuals are universal donors, meaning their blood can be given to people of any blood type.
A lot of people go through life not really thinking about their blood group, but there are three stages in life when blood groups are fundamentally important: during pregnancy, when a blood transfusion is necessary and when organ transplant is needed.
This test does not require fasting.