Mention a diagnostic test that can confirm strongyloidiasis.

Stool examination for larvae is the diagnostic test that can confirm strongyloidiasis because this disease, caused by the parasite Strongyloides stercoralis, often leads to the presence of larvae in the stool. The diagnosis is typically established by identifying the characteristic larvae during microscopic examination of stool samples, particularly in cases of chronic infection where the larvae may be shed intermittently.

This method is preferred due to its non-invasive nature and the direct correlation between the presence of larvae in feces and the active infection. Other tests may have roles in the broader clinical context; however, they do not provide the same direct evidence of strongyloidiasis as stool examination does. Blood cultures are not specific for detecting this parasite, X-ray imaging does not visualize parasitic infections, and skin biopsy is not typically utilized for diagnosing intestinal parasites.