Just few examples. Intestinal parasitic infections can often be diagnosed by examining the stool for eggs and parasites under a scope. Other parasitic infections i.e. Cutaneous larvae migran as pictured here--no testing needed! Trichinosis is an infection with larvae of a roundworm trichinella spiralis from infected-uncooked pork. This needs muscle biopsy. If u have trouble/concern, consult doc. Good luck.