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Important Note

Ova/Parasite Exam does not detect Cyclospora, Isospora, Cyptosporidium, and Microsporidium.  For Cyclospora and Isospora, order Modified Acid Fast Parasitology (LAB905).  For Cryptosporidium, order Cryptosporidium Exam (LAB2527).  For Microsporidium, order Microsporidia PCR Detection (LAB3576) performed at Mayo Medical Laboratory.

Please specify if If Cryptosporidium, Cyclospora or Microsporidium are suspected.

Fecal samples submitted in Total Fix or Unifix Transport Vials are required for testing at UVMMC. Fecal samples submitted in EcoFix or Formalin/PVA will be forwarded to Mayo Clinic Laboratories for testing. All other transport vials will be rejected.

The most sensitive and cost effective tests for the detection of parasites for patients who haven't traveled outside the United Stated are  Giardia and Cryptosporidium Antigen Tests.

Ova and Parasite stool specimens collected on inpatients that have been in the hospital for more than 3 days will have that sample rejected with the following reason: "The only infectious cause of nosocomially acquired gastroenteritis is Clostridium difficile. Please contact the Microbiology resident to discuss unique clinical situations."

Additional Codes

Primary ID

Epic Code

Mayo Access ID


LAB955 FAH5907


Specimen Information




Collect Vol

Submit Vol

Min Vol

Total Fix Vial Feces


10 mL 10 mL 1 mL 72 hours
Sterile Container Duodenal Aspirate* Ambient 10 mL 10 mL 1 mL 2 hours
Sterile Container Respiratory* Ambient 5 mL 5 mL 1 mL 2 hours
Sterile Container Other* Ambient 5 mL 5 mL 1 mL 2 hours
Sterile Container Urine** Ambient 5 mL 5 mL 1 mL 24 hours

Deliver specimen to the laboratory as soon as collected. All stool samples for ova & parasite should be collected in Total Fix Vial (supply #032040). Three samples may be necessary to detect certain parasites. These specimens should be collected every 24 to 48 hours during a time frame of no more than 10 days to detect intermittent shedding of parasites. If the patient has been hospitalized for more than 3 days, testing should not be performed. If the patient has not traveled outside of the U.S., order Cryptosporidium/Giardia antigen test.

*Submit sterile container within 2 hours of collection.

Collection and Transport of Sample for Fecal Ova and Parasites

  • Collect sample in a bedpan, avoiding contamination with urine.
  • If the patient is at home, collect specimen in Stool Collection Commode or have the patient put plastic wrap over the toilet bowl.
  • At least 1 mL (size of a walnut) of the sample is needed. Do not fill stool above the fill line on the transport vial
  • If the specimen cannot be transported to the lab within two hours, inoculate stool into a transport vial (Total Fix) which can be obtained from Customer Service (802) 847-5121. Transport to the lab within 72 hours.
  • All vials should be inverted several times so the sample and preservative are well mixed.

 **S. haemotobium adults are found in the portal vein of the urinary bladder in the infected human. Laboratory recovery depends upon repeated daily examinations of fresh urine specimens collected around noon. 

***Refrigerated samples are acceptable.

Test Schedule / Analytical Time / Test Priority

Monday – Friday / 1 day / Not available STAT


Trichrome Stain and Microscopic Exam on concentrate.


Description CPT Code
Ova & Parasite Exam 87177
Trichrome Stain 87209



Manual Method

Reference Range

No ova and parasites seen



Performing Location

University of Vermont Medical Center

Is the UVMMC lab NY State Certified to perform this testing?  Yes/No


Order Code LOINC

Order Code Reporting Name LOINC Code
OP Ova & Parasite Exam 673-4


Result Code LOINC

Result Code Reporting Name LOINC Code
12301006644 Parasite 673-4