Blood groups

There are 4 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 8 blood groups.

Antibodies and antigens
Blood is made up of red blood cells, white blood cells and platelets in a liquid called plasma. Your blood group is identified by antibodies and antigens in the blood.

Antibodies are proteins found in plasma. They're part of your body's natural defences. They recognise foreign substances, such as germs, and alert your immune system, which destroys them.

Antigens are protein molecules found on the surface of red blood cells.

The ABO system





There are 4 main blood groups defined by the ABO system:

blood group A – has A antigens on the red blood cells with anti-B antibodies in the plasma

blood group B – has B antigens with anti-A antibodies in the plasma

blood group O – has no antigens, but both anti-A and anti-B antibodies in the plasma

blood group AB – has both A and B antigens, but no antibodies
Blood group O is the most common blood group.





Almost half of the UK population (48%) has blood group O.

Receiving blood from the wrong ABO group can be life threatening. For example, if someone with group B blood is given group A blood, their anti-A antibodies will attack the group A cells.

This is why group A blood must never be given to someone who has group B blood and vice versa.

As group O red blood cells do not have any A or B antigens, it can safely be given to any other group.

The NHS Blood and Transplant (NHSBT) website has more information about the different blood groups.

The Rh system
Red blood cells sometimes have another antigen, a protein known as the RhD antigen. If this is present, your blood group is RhD positive. If it's absent, your blood group is RhD negative.

This means you can be 1 of 8 blood groups:

A RhD positive (A+)
A RhD negative (A-)

B RhD positive (B+)
B RhD negative (B-)

O RhD positive (O+)
O RhD negative (O-)


AB RhD positive (AB+)
AB RhD negative (AB-)

About 85% of the UK population is RhD positive (36% of the population has O+, the most common type).

In most cases, O RhD negative blood (O-) can safely be given to anyone. It's often used in medical emergencies when the blood type is not immediately known.

It's safe for most recipients because it does not have any A, B or RhD antigens on the surface of the cells, and is compatible with every other ABO and RhD blood group.

The NHS Blood and Transplant (NHSBT) website has more information about the Rh system.

This post has been edited by plouffle0789: Jan 16 2021, 05:08 PM

A+ pertamaxxx

True Asian.

+ la. Most of ppl is +

B+

A negative. Pusat Darah Negara sent this card after my first donation.

My blood group is O. But still unsure whether O+ or O-

O+ here.
Mosquitos magnet.

A-

O+

O-

Blood also have to racing ?

B -ve.

there are more than 8 blood group type. there's O rh-null

btw, B+ here

C++

i know a guy with O- and he donated blood every 3 months.

Whoever having O negative need superb becareful n dont involve in accidents or critical sickness cause not easy get O negative.

B+

I'm O-ve, every few months will drop my blood.

B