1/ Parasitic Disease Consultants offers Elisa testing for many parasites. The website says he was the former director of the CDC division of Parasitic Disease. Elisa testing differs from stool testing in which they look for antigens in the samples. He tests for about 25 parasites and most tests cost $75. I do not know anyone who has used this lab. It appears that a doctor's order is necessary to access the tests. http://www.parasitic.com/test.htm
2/ DRG Labs
3/ ParaWellness Labs is a trusted lab - done via microscope not elisa