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Every person has a specific blood type. Learn what determines your blood type and why it’s important to know what it is.
Blood typing is a test that determines a person’s blood type. The test is essential if you need a blood transfusion or are planning to donate blood. Not all blood types are...
Most blood bankers call it the “front-type,” but others call it “cell grouping” or “forward grouping.” Whatever you call it, this simple test gets you halfway to determining someone’s ABO type.
There are four major blood groups determined by the presence or absence of two antigens, A and B, on the surface of red blood cells. In addition to the A and B antigens, there is a protein called the Rh factor, which can be either present (+) or absent (–), creating the 8 most common blood types (A+, A-, B+, B-, O+, O-, AB+, AB-).
The test to determine your blood group is called ABO typing. Your blood sample is mixed with antibodies against type A and B blood. Then, the sample is checked to see whether or not the blood cells stick together. If blood cells stick together, it means the blood reacted with one of the antibodies.
A lab test called a type and screen—sometimes referred to as blood typing —confirms a person’s blood type. A type and screen test is not part of routine blood work, but you can still ask your doctor to perform this test if you're curious. This blood test is most commonly ordered when:
The ABO system has four major blood types: A, B, AB, and O. Blood types are further categorized by the presence (positive or +) or absence (negative or -) of the Rh (D) antigen on the surface of their red blood cells, also known as the Rh factor. This produces the eight major blood types. A and B antigens are sugars.
Your doctor can use blood typing and crossmatching to identify your blood type and learn if it’s compatible with donor blood or organs. Blood typing reveals what type of blood you have.
A blood type lab test identifies certain inherited substances (antigens) that may be present on the surface of red blood cells and classifies them into four common groups: A, B, AB, or O, and is known as the ABO system. In addition, a second system, the Rh system, determines if the red blood cells are Rh-positive or Rh-negative.
The test to determine your blood group is called ABO typing. Your blood sample is mixed with antibodies against type A and B blood. Then, the sample is checked to see whether or not the blood cells stick together. If blood cells stick together, it means the blood reacted with one of the antibodies.