A(+/-): Contains "A" agglutinogens only.
B(+/-): Contains "B" agglutinogens only.
AB(+/-): Contains "A" and "B" agglutinogens.
O(+/-): Contains neither "A" nor "B" agglutinogens.
Difference between Positive and Negative Blood Types
Positive Blood types contain Rh protein and the Negative Blood types do not contain Rh protein.
Blood Mixing and Transfusions
As demonstrated below, all the negative blood types can only recieve negative blood. Considering this, with O being able to give to any type, O- can be injected into anyone; this works exceptionally well in an emergency when the patient has lost a lot of blood. Also, the reason why some blood mixes don't work is because of antibodies that attack the the blood cells that contain their type of agglutinogens.
A+:
Contains B antibodies.
Can Recive Blood from: A+, A-, O+, O-.
A-:
Contains B antibodies.
Can Recive Blood from: A-, O-.
B+:
Contains A antibodies.
Can Recive Blood from: B+, B-, O+, O-.
B-:
Contains A antibodies.
Can Recive Blood from: B-, O-.
AB+:
Contains no antibodies.
Can Recive Blood from: A+, A-, B+, B-, AB+, AB-, O+,O-. (Any)
AB-:
Contains no antibodies.
Can Recive Blood from: AB-, A-, B-, O-.
O+:
Contains both A and B antibodies.
Can Recive Blood from: O+, O-.
O-:
Contains both A and B antibodies.
Can Recive Blood from: O-.
Lab Findings:
I learned that blood type is slightly helpful in determining a culprit in a crime. But the fact is that there are only eight types of blood; and it doesn't really pinpoint a suspect unless you have narrowed it down already.
http://chapters.redcross.org/br/northernohio/INFO/bloodtype.html
http://learn.genetics.utah.edu/content/begin/traits/blood/
http://nobelprize.org/educational_games/medicine/landsteiner/readmore.html
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