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The subject of blood types is a constant source of confusion to patients. Parents are often anxious because they do not know their children's blood types, afraid that in some way this might jeopardize their care in an emergency situation. This is a groundless fear; if the blood type is ever needed, it is obtainable in a couple of minutes in the lab.
The blood groups of humans are listed for your edification and amusement; they are listed in descending order of frequency in the population:
The system works like this: a person receives one blood group gene and one Rh factor gene from each parent. The blood group gene can be either type A, B, or O (which is actually simply the absence of either type A or B, a point of some additional confusion). These genes determine what markers (antigens) are present on the surface of the blood cells. A cell may carry the A antigen, the B antigen, both A and B, or neither (that is, Type O).
Blood types are generally of no consequence in life or even in medicine unless a person needs to receive blood (or be a transplant donor or recipient, to get rather far afield here). Knowing your child's blood type does almost no good in the real world. If your child were ever in an accident and needed blood immediately,
Another broad area of misunderstanding is of course the issue of determining paternity by blood types. This is essentially no longer used now because more sophisticated and accurate DNA tests are used.
The only time we routinely do blood types on children is when they are born, and in most hospitals, only if the mother is type O or is Rh factor negative.