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Parasitology - Ova and Parasite Exam



Other Names Amebiasis; Ascaris lumbricoides; Balantidium; Blastocystis hominis; Coccidia; Cryptosporidium; Cyclospora; Dientamoeba fragilis; Diphylobothrium latum; Entamoeba histolytica; Enterobius vermicularis; Fluke; Giardia lamblia; Hookworm; Hymenolepis; Sarcocystis; Schistosoma mansoni; Schistosoma japonicum; Strongyloidiasis; Strongyloides stercoralis; Taenia; Trichuris
How to Order
Check the appropriate box, under PARASITOLOGY,  on the General Microbiology Request Form.
County and State Agencies
Standard reference Parasitology procedures for PVA and Formalin preserved fecal specimens  including Formalin Ethyl Acetate Concentration and Trichrome stain
Daily on regular business days
Time to Reporting
2 to 5 working days after receipt of specimen
CPT Code
87177, 87209

Specimen Collection Details

Collection kits available on request. Collect fresh stool. Avoid contact of feces with urine or water. Place stool in Formalin and PVA vials to fill line and mix well. Collect up to three specimens on alternate days as needed.
Optimal Volume
Fill formalin and PVA vials to fill lines
Minimum Volume
2 to 5 grams depending on stool consistency
Handle with caution. Formalin vial contains 6% formaldehyde solution. Contact poison control if needed; contact information may be on vial.
Specimens may be stored at room temperature pending transport. Refrigeration is also acceptable.
Transport specimens at room temperatures. Transport at refrigerated temperatures is also acceptable.
Rejection Criteria
Specimens not submitted in appropriate fixative.
Specimens are subject to the requirements of the OSPHL Specimen Submission Policy and Criteria, available at:
Certain drugs and compounds will render stool specimens unsatisfactory for examination. Among these are antidiarrheal compounds (kaolin-pectate, etc.) antibiotics, antacids, bismuth and barium. Specimens used for parasitologic examination should be obtained before these compounds are used or collection must be delayed until the effects have passed (antiparasitical agents, 10 days to 3 weeks; others, 7-10 days).
For addition information or assistance, please contact the laboratory at 503-693-4100.