Ova and Parasite Exam, Fecal (Immunocompromised or Travel History)
Ordering Recommendation

If parasite infection is suspected as cause of persistent diarrhea (> 14 days), specific pathogen testing is recommended (refer to Gastrointestinal Parasite Panel by PCR (2011150); Giardia Antigen by EIA (0060048); Entamoeba histolytica Antigen, EIA (0058001); or Cryptosporidium Antigen by EIA (0060045)). Do not order for patients who develop diarrhea during a prolonged hospitalization.

Qualitative Concentration/Trichrome Stain/Microscopy
3-7 days
New York DOH Approval Status
This test is New York DOH approved.
Submit With Order
ARUP Consult®
Disease Topics
Specimen Required
Patient Preparation
Specimens analyzed to determine the efficacy of treatment should be collected three to four weeks after completion of therapy. Antibiotics may affect results of exam. 
Stool. Recommended collection: 3 separate stool specimens within a 5-7-day period (an individual order must be submitted for each specimen)
Specimen Preparation
Transfer 2 g of stool within one hour of collection into AlcorFix (ARUP Supply #52059) available online through eSupply using ARUP Connect ™ or contact ARUP Client Services at (800) 522-2787. (Min: 1 g)
Also acceptable: Transfer 5 g of stool within one hour of collection into both 10 percent formalin and modified PVA (10 g total). (Min: 10 g total)
Additional specimen collection instructions can be found at 
Storage/Transport Temperature
Room temperature. 
Unacceptable Conditions
Rectal swabs. Multiple specimens (more than one in 24 hours). Unpreserved specimens. Specimens containing barium, oil, or urine. 
Indicate suspected parasites. 
Ambient: 9 months; Refrigerated: 9 months; Frozen: Unacceptable 
Reference Interval
Interpretive Data
Method for identification of Ova and Parasites includes wet mount and trichromes stain.

Due to the various shedding cycles of many parasites, three separate stool specimens collected over a 5-7-day period are recommended for ova and parasite examination. A single negative result does not rule out the possibility of a parasitic infection. Stool antigen testing is the optimal test method for determining the parasitic presence of Giardia, Cryptosporidium spp, or Entamoeba histolytica. The ova and parasite exam does not specifically detect Cryptosporidium, Cyclospora, Cystoisospora, and Microsporidia. For Cryptosporidium, refer to Cryptosporidium Antigen by EIA (ARUP test code 0060045). For Cyclospora and Cystoisospora, refer to Parasitology Stain by Modified Acid-Fast (ARUP test code 0060046). For Microsporidia, refer to Microsporidia Stain (ARUP test code 0060050).

For Ova and Parasite exams from non-stool sources, refer to Ova and Parasite Exam, Body Fluid or Urine (ARUP test code 2002277). For Cryptosporidium, Cyclospora and Cystoisospora stains, refer to Parasitology Stain by Modified Acid-Fast (ARUP test code 0060046). For macroscopic parasite identification (worms or proglottids), refer to Parasite Examination, Macroscopic (ARUP test code 2007361).
Hotline History
View Hotline History
Component Test Code*Component Chart NameLOINC
2002274Ova and Parasite, Trichrome Stain43227-8
2002275Ova and Parasite, Wet Mount10704-5
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.
  • Parasitic Exam
  • Ascaris
  • Chlonorchis sinensis
  • Eggs or Cysts
  • Fasciola
  • Giardia Exam
  • Helminths
  • Isospora, Isospora belli, Cystoisospora
  • O and P
  • Opisthorchis sinensis
  • Parasites
  • Parasitic examination, stool
  • parasitic worms
  • Parasitology Examination
  • Protozoa
  • S. haematobium
  • S. japonicum
  • Sarcocystis
  • Schistosoma mansoni
  • Strongyloides