In many cases genetic testing will determine if a person is a carrier of a certain disorder, such as Down syndrome or sickle cell anemia, and if they are thus susceptible to certain diseases. Other tests, however, can also be done that idn poker include analyzing the DNA left within cells of the body from people with card deficiency diseases. Through analysis, doctors are able to determine a person's specific genetic makeup and their susceptibility to certain diseases. Some examples include the results of DNA tests on twins and triplets, which indicate if they share identical DNA, or whether each one is genetically different.