The diagnosis of giardiasis requires the detection of Giardia in at least 1 out of 3 stool samples upon ova and parasite examination. Multiple stool collections (i.e., three stool specimens collected on separate days) should be performed for ova and parasite examination (O & P) to increase test sensitivity since Giardia cysts are excreted intermittently (detection of apprroximately 80% of cases). Blood samples are usually unremarkable. Fecal immunoassays may also be used for the diagnosis of Giardia if stool collections were negative and giardiasis is still suspected. Only molecular testing, such as polymerase chain reaction techniques, can be used to identify the subtypes of Giardia. Blood samples are usually unremarkable.
Giardiasis laboratory findings
Enterobiasis laboratory findings
Viral gastroenteritis laboratory findings
Schistosomiasis laboratory findings
Giardiasis physical examination
Whipple's disease laboratory findings
Campylobacteriosis laboratory findings
Cryptosporidiosis physical examination