The blood group is an individual biologicalan indicator of a person who describes the antigenic indicators of blood cells - red blood cells. This indicator does not change throughout life, so once you determine it, you can not do it again. To learn how to determine the blood type, you need to contact any medical laboratory.
Of course, to find out which of the four groupsblood in a person, you need to pass it, since this information can not be obtained from other tissues of the body. Previously, for analysis, only the venous blood was needed (which, accordingly, is taken from the vein). But now technology allows you to explore this important indicator by collecting blood from your finger. More information about the methods of determining blood groups can be found in our article - How to recognize the blood group.
To determine the blood type and Rh factorhuman under laboratory conditions use the so-called immune-haematological reaction. For her conduct laboratory assistant on flat dishes (Petri dish) makes 8 pencil marks (by the number of groups and the Rh factor). A suitable drop of the reference serum is placed near them, a drop of blood is applied to each of these markers. When the blood and the reference serum coincide, an agglutination reaction will occur, ie the physiological fluid will curd up, which can be visually assessed as a precipitation after five minutes.
To confirm the accuracy of the determination of the Rh factor, in addition to the isoserological reaction, a cross reaction is carried out using group A and B.
Interesting is the fact that, based on the analysis of blood, you can determine the sex of the fetus - more on this in our article - How to determine the sex of the child by blood group.