Microscopic demonstration of the large typically shaped oocysts is the basis for diagnosis. Because the oocysts may be passed in small amounts and intermittently, repeated stool examinations and concentration procedures are recommended. If stool examinations are negative, examination of duodenal specimens by biopsy or string test (Enterotest) may be needed. The oocysts can be visualized on wet mounts by microscopy with bright-field, differential interference contrast (DIC), and epifluorescence. They can also be stained by modified acid-fast stain. Typical laboratory analyses include: * Microscopy * Morphologic comparison with other intestinal parasites * Bench aids for Cystoisospora
Isosporiasis
Cyclosporiasis
Paragonimiasis
Necatoriasis
Mansonelliasis
Bertielliasis
Metagonimiasis
Thelaziasis