Кал на яйца и личинки гельминтов, простейшие и их цисты (на автоматическом анализаторе)

Stool examination for helminth eggs, larvae, protozoa, and cysts by the Parasep concentration method supports the diagnosis of intestinal parasitic infections as well as asymptomatic carriage. The assay also serves to assess treatment response and document clearance following antiparasitic therapy. By employing a closed formalin–ether sedimentation approach, the Parasep method increases the likelihood of detecting low-burden shedding of helminths and protozoa.

Intestinal parasitic infections are prevalent worldwide and range from silent carriage to severe gastrointestinal disease. Transmission commonly follows inadequate sanitation, contaminated water, unwashed produce, or undercooked meat and fish. Frequent etiologies include helminths such as Ascaris spp., hookworms, Enterobius vermicularis, Taenia spp. (beef and pork tapeworms), and Trichinella spp., as well as protozoa including Giardia and pathogenic amoebae. Clinical manifestations span watery or dysenteric diarrhea, cramping abdominal pain, nutrient malabsorption with weight loss, allergic phenomena, and iron-deficiency anemia. Light microscopic examination of stool remains the primary method to identify helminth eggs and protozoan cysts. Direct smears may be insensitive when organism burden is low or shedding is intermittent. Concentration techniques improve yield by enriching diagnostic forms prior to microscopy. The Parasep system is a closed, laboratory-ready modification of formalin–ether sedimentation that streamlines processing and reduces biohazard exposure. Specimen is combined with reagents in a dedicated tube and centrifuged so that eggs and cysts, separated by specific gravity, accumulate in a concentrated layer for microscopic review. Because many parasites are shed intermittently, a single negative result does not exclude infection. When clinical suspicion persists despite an initial negative study, repeat stool examinations spaced over several days may be required.