What are some rare blood types?
Within the ABO/Rhesus group systems, which are used to classify most types of blood, there are several rare blood types. The most precious is AB-, and less than one percent of the world's population has this blood type. B- and O- are also very rare, each representing less than 5% of the world's population. In addition to these basic two, however, there are more than 30 recognized blood writing systems, creating a number of rare blood types, some of which only appear in a handful of people.
The blood type is determined by the presence of certain antigens in the blood. Antigens A and B are very common, which makes it easier to classify people with antigen, while people with blood type O do not have antigen. The negative or positive symbol of the blood type indicates the presence or lack of its factor rhesus. However, other antigens for A and B may be present, and these antigens may respond with blood from certain donors. For example, someone with a rare blood type may appear, be+, but he or she could miss anotherAntigen that could cause a bad response to donor blood that contained this antigen.
People in Bombay's blood type lack antigens A and B, which would normally place them in the O Group, except that they lack antigen, present in people with blood types. This blood type is also referred to as "HH blood group" and is named for the Indian area where it has been discovered.
Some other antigens used in blood creation include: D factor, factor C, E factor, factor M, factor L (A), factor K, factor FY (A), factor JK (B) and factor FY (B), among other things. This means that someone can have a blood type such as ab-: fy (b)-, k-. If the blood was from a negative donor containing a factor K, it could be reached. Sometimes these factors are referred to with names, as in "Duffy Negative" for people to whom mistakesFY (A) and FY (B), referring to a particular patient who first exposed the property.
The blood type is inherited and many rare types of blood are found in specific communities and ethnic groups. For example, African -Americans are more at risk of being negative. Therefore, it is important that people from all ethnic groups donate blood, increase the likelihood of finding the corresponding donor. When blood must be proven from more than 200 donors to find a patient match, this patient has a blood type that is considered rare, but some people with rare blood types would be lucky if they found blood that coincided in one of 200 gifts. Some people with rare blood are banking their own blood before surgical procedures to ensure that they are available to blood.