Detection of Protozoa in Stool

Detection of Protozoa in Stool Smear – this is a microscopic parasitological examination aimed at detecting protozoa – unicellular parasites that can cause gastrointestinal infections. The most commonly examined species are: Giardia (Giardia lamblia), Amoeba (Entamoeba histolytica), and Balantidium (Balantidium coli). These parasites are transmitted via the fecal-oral route, usually through contaminated water or food, and are often found in children's groups or when traveling to countries with poorer sanitary conditions.

The test is useful in diagnosing intestinal parasitic diseases, which can manifest as chronic diarrhea, abdominal bloating, nausea, weight loss, or unexplained weakness. Giardiasis is particularly common in the pediatric population and can cause both acute and chronic intestinal infections.

Test Principle: During the test, a fresh stool smear is prepared, which is examined under a microscope to identify protozoan vegetative forms (trophozoites) or cysts. Special staining methods (e.g., Lugol's solution or Giemsa stain) are used to more accurately identify microorganisms.

Recommendations:

• Recommended for suspected intestinal parasitic infections, especially with prolonged diarrhea or during travel to endemic areas.
• The best sample is a fresh stool sample, collected in the morning, as some protozoan forms quickly die in the environment.
• It is recommended to repeat the test several times on different days due to the possible intermittent shedding of parasites.
• Antibiotics, antiparasitic drugs, or laxatives should not be taken for 2–3 days before the test unless otherwise directed by a doctor.
• The sample should be collected in a clean, dry container, without urine or water impurities.