Final answer:
A stool ova and parasite (O&P) exam is performed to determine the number of parasite eggs per gram of feces. This test involves direct examination of a stool sample under a microscope.
Step-by-step explanation:
The test performed to determine the number of parasite eggs per gram of feces is called a stool ova and parasite (O&P) exam. During this exam, a stool sample is directly examined under a microscope to look for the presence of cysts and trophozoites of parasites. The exam can help diagnose common parasitic intestinal infections.