Are there any generic (not dependent on symptoms) ways to find parasite infections? Are there any generic ways to determine if a person is infected with a parasite? With "generic ways" I mean ways that do not rely on symptoms caused by a particular parasite. Also I am mainly concerned by parasites that are too large for the immune system to completely handle on its own (such as worms). For example, can parasites be seen in x-rays, MRI scans, or through some body fluid samples?

The first thing that comes to mind would be eosinophils numeration. It is a specific type of white blood cell that handles parasitic infections. So in most cases, a blood sample would show an increase in this type of cell.