Establish possibility of infection (travel to endemic areas, etc)
Uncomplicated strongyloidiasis: 3 serial stool samples screened for ova and parasites, as well as ELISA for<unk> 
Complicated strongyloidiasis: blood/sputum cultures, in addition to above
Notable eosinophilia in up to 70% of cases, though can be absent in immunosuppressed
Gram negative bacteremia may be present in immunocompromised
Complicated strongyloidiasis: blood/sputum cultures, in addition to above
Strongyloides stercoralis
Inflammatory bowel disease
Ascaris lumbricoides
Schistosomiasis
Trichuris trichiura
Filariasis
Taenia saginata
Hookworm