ASCP Parasitology Practice Exam

The diagnostic procedure for Echinococcus granulosus, which causes hydatid disease, involves the microscopic examination of hydatid fluid aspirated from a cyst. When an Echinococcus infection occurs, the parasite forms fluid-filled cysts, usually in the liver or lungs. By aspirating this fluid from a cyst and examining it microscopically, features such as protoscolices or hooks can be identified, confirming the presence of Echinococcus granulosus. Other diagnostic methods listed, like microscopic examination of blood smears, are typically used for other parasitic infections such as malaria. Urinalysis with cystoscopy is not relevant to Echinococcus but rather pertains to urinary tract conditions or infections. Stool culture for parasites is generally employed for intestinal parasites, and Echinococcus does not typically shed eggs in the feces until the adult stage, which resides in canids. Thus, aspirating and analyzing the hydatid fluid offers the most direct and specific diagnostic approach for this parasitic infection.