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Test Code M75 Ova and Parasites

Important Note

Specimens containing dirt, barium, bismuth, anti-diarrheal compounds, antibiotics or oil are unsatisfactory for parasite exam. One week must elapse after the administration of barium or bismuth before a specimen can be submitted for ova and parasite exam.

Two weeks must elapse after antibiotic therapy before a specimen can be submitted for ova and parasite exam. Do not contaminate the stool with urine or water.

If the physician orders ova and parasites "times 3", collect the specimen as a single specimen on three separate days. Ideally, the specimens should be collected on alternate days.

Para-pak collection kit consists of one vial containing 15 ml of pva fixative and one vial containing 15 ml of 10% formalin preservative. These liquids are poisonous. If any liquid from the tubes comes in contact with skin or eyes, flush with running water. If irritation develops, consult a physician.

Additional Codes


PowerChart: Ova and Parasites

Epic: LAB258 Ova and Parasite Screen

Test Method

Direct Smear, Concentration with Trichrome Stain

Specimen Requirement

Stool collected in ParaPak collection kit.

Additional Specimen Collection Information

Parapak collection kit: 2 vials containing preservatives; one pink-capped and one blue-capped. Check expiration date on kit prior to use. Do not use expired collection kits.
Note:  Fresh unpreserved stool specimens must be placed in fixatives within one hour after collection.

  1. Pass the stool into a clean, dry container or bedpan.
  2. Do not allow urine to contaminate specimen in the collection container.
  3. Open one of the vials containing liquid.
  4. Use the collection spoon built into the lid of the vial to place a small scoopful of stool from areas that appear bloody, slimy or watery into the vial until the liquid level rises to the red line.
  5. If the stool is formed [hard], sample small amounts from each end and the middle.
  6. Mix the contents of the vial with the spoon, twist the cap tightly closed and shake the vial vigorously until the contents are well mixed.
  7. Repeat instructions for the second collection vial.
  8. Complete the labeling information on each vial.
  9. Also check the box on the label, which best describes the consistency of the specimen when collected [formed, loose, soft, watery].
  10. Place the two vials in the plastic bag the tubes came in and seal the bag.
  11. Return the collection kit to the laboratory.


Performed Monday through Saturday.

Typically completed within 24 hours after the specimen arrives at the testing site.

Reference Values

No ova or parasites seen.

If parasites are present, they are identified.

Positive results are called to the nurse's station or physician office.

CPT Code Information

87177 Identification of Organism from Primary Source and Sensitivity Studies: Ova and parasites, direct smears, concentration and identification

Useful For

Detection of Cryptosporidium and Giardia parasites in clinical specimens.

LOINC Code Information

10701-1 Ova And Parasites Identified In Stool By Concentration