Not all blood is alike. Learn about blood typing and the rarest and most common types of blood and how they can impact your blood donation.

The ABO blood types were first discovered by an Austrian physician, Karl Landsteiner, working at the Pathological-Anatomical Institute of the University of Vienna (now Medical University of Vienna).

Mar 14, 2023 · There are eight blood types included in the ABO and Rh blood group systems: A positive (A+), A negative (A-), B positive (B+), B negative (B-), AB positive (AB+), AB negative (AB-), O …

Feb 19, 2025 · Learn what determines your blood type and why it's important. Understand blood type compatibility, donation guidelines, and the need for safe transfusions.

Dec 7, 2025 · 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 …

Nov 28, 2023 · It categorizes blood into four main types: Type A: Has A antigens on the red cells and anti-B antibodies in the plasma. Type B: Has B antigens with anti-A antibodies in the plasma. Type …

Dec 18, 2025 · ABO blood group system, the classification of human blood based on the inherited properties of red blood cells (erythrocytes) as determined by the presence or absence of the …

Dec 20, 2025 · Different blood types include A, B, AB, and O, classified by the ABO system. Your Rh factor determines if your blood type is positive or negative.

Mar 31, 2024 · Blood is often grouped according to the ABO blood typing system. The 4 major blood types are: A blood sample is needed. The test to determine your blood group is called ABO typing. …

Nov 29, 2025 · The ABO system is the most significant method for classifying human blood, based on inherited characteristics found on the surface of red blood cells. This classification is foundational in …