Blood grouping
Surgery for, pregnancy, blood transfusions ... In these cases, the doctor will never forget to ask for a blood test to determine your blood type. There is no change at all blood throughout life, remember yours after reviewing ...
What blood group?
Blood group system categorization and identification of blood from each individual. It corresponds to an antigen present on the surface of red blood cells.
The ABO system is the main method for classifying blood. It is obtained after detection of antigens on erythrocytes and antibodies in the blood serum. Normally, a person has an antibody to an antigen that does not have, because the presence of a specific antibody to an antigen in the blood leads inevitably to the destruction of red blood cells.
These types of antibodies are called agglutinins regular.
Thus, in this system, blood is classified into four main groups:
The group A is provided with the A antigen, the presence of anti-B antibodies in serum,
The group B is provided with the B antigen, the presence of anti-A antibodies in the serum,
AB is provided on both A and B antigens, no antibodies in the serum,
Group O has no antigen on the surface of red blood cells but develops anti-A and anti-B antibodies in the serum.
The blood of a child often depends on the parent and is transmitted by heredity.
The Rhesus system, what is it?
The Rhesus system is a method of classifying blood according to the presence or absence of the D antigen on the surface of red blood cells. This is called a negative Rhesus (Rh) in the absence of the D antigen, and an Rh positive (Rh +) if the presence of the D antigen (Rh-).
Search for irregular antibodies or RAI
The irregular antibodies which are antibodies specific to develop without the existence of a corresponding antigen.
These antibodies may occur during pregnancy or by transfusion of incompatible blood.
Examination
Knowledge of blood is essential before a blood transfusion. Indeed, it is mandatory that the blood introduced is compatible with the patient's blood to prevent the destruction of red blood cells. However, by default analysis (in case of emergency, for example), group O is a universal donor because there are no dangerous antigen for red blood cells.
When analyzing the blood, it is mandatory to know the identity of the patient. It is necessary that both tests are done to determine the blood group of an individual.
There are two methods for determining the blood group of an individual. The blood sample is spread on a slide. And when blood is in contact with an antibody or antigen, waits until the biologist or absence of an agglutination reaction or aggregate formation:
The test Beth Vincentconsiste to detect red cell antigens using known antibody
The Simonin test is to detect antibodies in the serum using known antigens
The result
Thus, agglutination is obtained when the antigen is in contact with its specific antibody.
Surgery for, pregnancy, blood transfusions ... In these cases, the doctor will never forget to ask for a blood test to determine your blood type. There is no change at all blood throughout life, remember yours after reviewing ...
What blood group?
Blood group system categorization and identification of blood from each individual. It corresponds to an antigen present on the surface of red blood cells.
The ABO system is the main method for classifying blood. It is obtained after detection of antigens on erythrocytes and antibodies in the blood serum. Normally, a person has an antibody to an antigen that does not have, because the presence of a specific antibody to an antigen in the blood leads inevitably to the destruction of red blood cells.
These types of antibodies are called agglutinins regular.
Thus, in this system, blood is classified into four main groups:
The group A is provided with the A antigen, the presence of anti-B antibodies in serum,
The group B is provided with the B antigen, the presence of anti-A antibodies in the serum,
AB is provided on both A and B antigens, no antibodies in the serum,
Group O has no antigen on the surface of red blood cells but develops anti-A and anti-B antibodies in the serum.
The blood of a child often depends on the parent and is transmitted by heredity.
The Rhesus system, what is it?
The Rhesus system is a method of classifying blood according to the presence or absence of the D antigen on the surface of red blood cells. This is called a negative Rhesus (Rh) in the absence of the D antigen, and an Rh positive (Rh +) if the presence of the D antigen (Rh-).
Search for irregular antibodies or RAI
The irregular antibodies which are antibodies specific to develop without the existence of a corresponding antigen.
These antibodies may occur during pregnancy or by transfusion of incompatible blood.
Examination
Knowledge of blood is essential before a blood transfusion. Indeed, it is mandatory that the blood introduced is compatible with the patient's blood to prevent the destruction of red blood cells. However, by default analysis (in case of emergency, for example), group O is a universal donor because there are no dangerous antigen for red blood cells.
When analyzing the blood, it is mandatory to know the identity of the patient. It is necessary that both tests are done to determine the blood group of an individual.
There are two methods for determining the blood group of an individual. The blood sample is spread on a slide. And when blood is in contact with an antibody or antigen, waits until the biologist or absence of an agglutination reaction or aggregate formation:
The test Beth Vincentconsiste to detect red cell antigens using known antibody
The Simonin test is to detect antibodies in the serum using known antigens
The result
Thus, agglutination is obtained when the antigen is in contact with its specific antibody.
Groupe
|
Réaction avec anti-A
|
Réaction avec anti-B
|
Groupe A
|
+
|
-
|
Groupe B
|
-
|
+
|
Groupe AB
|
+
|
+
|
Groupe O
|
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