Standardization ..................................................................................................................... 20. Efficiency Defined and Measured in the Operating Room...........................................................
There are four major blood types: A, B, AB, and 0. The blood types are determined by proteins called antigens (also called agglutinogens) on the surface of the RBC. There are two antigens, A and B. If you have the A antigen on the RBC, then you have type A blood. When B antigen is present, you have type B blood. When both A and B antigens are present, you have type AB blood. When neither are present, you have type O blood.
There are two types of blood tests: A quantitative blood test measures the exact amount of hCG in the blood. Based on the results, the age of the fetus can be approximated. Unlike the qualitative test, this test can tell if the pregnancy is developing normally.