memonoob.blogg.se

In Singapore, most people are Rhesus positive (A+, B+, O+, AB+), and less than 1% of the population are Rhesus negative (A-, B-, O- and AB-).

So what’s the population like for the different blood groups in Singapore? Each red cell has more than a million markers on its surface.Ģ. This results in a total of eight main blood groups: A+, A-, B+, B-, O+, O-, AB+ and AB-.įUN FACT!: Each drop of blood contains 200-300 million red blood cells. Within the Rh system, depending on the presence or absence of RhD antigen, you can be either RhD positive (+) or RhD negative (-) If you are group A, this means A markers are present on the surface of your red cells group AB means both A and B markers are present on the surface of your red cells while group O means there are no A or B markers on the surface of your red cells. Within the ABO system, there are four main groups - A, B, O, AB - determined by the presence or absence of A and B antigens on the surface of red blood cells. How many blood groups are there? What do the ‘letter’, ‘+’, and ‘-’ mean?ĪBO and Rhesus (Rh) are the two most important blood group systems.įUN FACT!:There are near to 40 human blood group systems recognized by the International Society of Blood Transfusion (ISBT), with ABO and Rh being just two of them.