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en.wikipedia.org/wiki/Blood_type

A complete blood type would describe a full set of 30 substances on the surface of red blood cells, and an individual's blood type is one of many possible combinations of blood-group antigens. Across the 36 blood group systems, 308 different blood-group antigens have been found. Almost always, an individual has the same blood group for life, but very rarely an individual's blood type chang...

www.nhs.uk/conditions/Blood-groups

There are four main blood groups (types of blood) – A, B, AB and O. Your blood group is determined by the genes you inherit from your parents. Each group can be either RhD positive or RhD negative, which means in total there are eight main blood groups. Antibodies and antigens. Blood is made up of red blood cells, white blood cells and ...

www.livescience.com/36559-common-blood-type-donation.html

In general, the rarest blood type is AB-negative and the most common is O-positive. Here's a breakdown of the most rare and common blood types by ethnicity, according to the American Red Cross ...

www.disabled-world.com/calculators-charts/blood-chart.php

Some Quick Facts Regarding Blood Types/Groups. About 5 million Americans need blood transfusions every year. Receiving blood from the wrong ABO group can be life threatening. Your body carries around four to six liters (7 to 10.5 pints) of blood. Almost half (48%) of the UK population has blood group O, making this the most common blood group.

www.redcrossblood.org/donate-blood/blood-types.html

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-).

readanddigest.com/know-your-blood-type-different-types-of-blood-groups

A+ blood group may receive blood from groups A+, A- , O+, or O-, while A- may do so from A- and O-. The donors for B+ may be from blood groups B+, B-, O+, or O-., wherein for B- may be B- or O-. The universal donors are however grouping O- as they may donate blood to any blood Type without causing any kind of adverse reactions.

www.britannica.com/science/blood-group

Blood group, classification of blood based on inherited differences in antigens on the surfaces of the red blood cells. The most well-known classification, the ABO blood group system, was developed by Austrian-born American biologist Karl Landsteiner in 1901. Learn more about blood groups in this article.

en.wikipedia.org/wiki/Human_blood_group_systems

The term human blood group systems is defined by International Society of Blood Transfusion as systems in the human species where cell-surface antigens—in particular, those on blood cells—are "controlled at a single gene locus or by two or more very closely linked homologous genes with little or no observable recombination between them", and include the common ABO and Rh (Rhesus) antigen...

stylesatlife.com/articles/types-of-blood-groups

See More: Types Of Beer List. 9. Blood Group B-: This is the rare blood group and unique. On conduction of survey it is known that only one among 67 people has B negative blood group on an average of 1.5%. 10. Blood Group O: Blood group O is termed as blood group zero in some countries. This group does not have antigen A and antigen B on red ...

www.lalpathlabs.com/blog/what-are-the-types-of-blood

The human blood consists of the components, Red blood cells, White blood cells, Plasma and Platelets. The red blood cells are the ones that give blood its identity or ‘type.’ The ABO system is the principal blood grouping system used for humans which categorises people into one of the following four groups – A, B, AB, or O.