Test Overview

Test Methodology

Microscopic Exam

Test Usage

Establish the diagnosis of parasitic infestation

Reference Range*

No parasites seen

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Limitations

The specimen will be examined for parasites only. One negative result does not rule out the possibility of parasitic infection. It is unlikely that trophozoites can be detected in specimens which are not sent in the appropriate transport vial.

Test Details

Days Test Performed

Monday - Friday

Analytic Time

48 hours
Specimens received on Friday 3pm through Sunday 3pm will have an extended analytic time.

Soft Order Code


MiChart Code

Ova and Parasite Screen



Trichrome Stain
Feces, Ova and Parasites
Parasite Exam, Stool
Parasite Examination, Stool
Rectal, Ova and Parasites
Sigmoid, Ova and Parasites
Stool, Ova and Parasites
Feces, Ova and Parasites
Parasite Exam, Stool
Stool, Ova and Parasites

+ See More



Looking to Order a Test?

We’ve provided helpful links to make ordering easy.

Find a Requisition

All specimens should be accompanied by a requisition.

Submitting Specimens

Learn about how to properly label and where to ship specimens.

Order Kits and Supplies

MLabs provides all the supplies necessary for the collection of specimens.

Test FAQ

Visit our provider FAQ and learn about common questions to ordering tests.

Specimen Requirements

Offsite Collection Instructions

Collect fresh random stool or sigmoid specimen. Specimens obtained with mineral oil, bismuth, or magnesium compounds are not acceptable. Wait until patient has cleared substance (about 7-10 Days) before collecting stools for examination. Stool specimens MUST be sent in Ova and Parasite transport kit. Emulsify stool specimen thoroughly in transport vial fluid. If necessary, place a urine bag on the patient to prevent urine contamination. Specimen should not come in contact with water. Continue adding stool to the transport until specimen reaches the fill line. Transport kits may be held up to 1 week at room temperature. RECOMMENDED SCREENING: 2 stool specimens, one every other day. Note on requisition if a Cryptosporidium or Cyclospora cayetanensis exam is needed as a special staining procedure must be performed. Indicate specimen source and collection date/time. Specimens contaminated with urine, water, or interfering substances such as barium, bismuth, Metamucil, caster oil, or mineral oil are unacceptable. If unacceptable specimen is received, the client will be notified before disposal of the original specimen. Only submit 1 specimen per day.
See MLabs Stool Specimen Collection Instructions available online at http://mlabs.umich.edu/files/pdfs/GL-Stool_Collection_Guidelines.pdf for patient instructions.
Gastrointestinal panel (GIPAN) should be considered at additional cost, when multiple stool tests are desired . GIPAN is performed by real time PCR and identifies 21 stool pathogens.

Rejection Criteria

Specimen not in transport or not completely emulsified in transport liquid; less than minimum volume; barium or other interfering substances in the stool; patient in-house >3 days


Test should not be performed on patients who have received administration of barium, bismuth, Metamucil, castor oil, or mineral oil.

Normal Volume

5 mL stool

Minimum Volume

5 mL stool

Additional Information

Test includes microscopic examination of concentrate and trichrome stained smear. PMN, red blood cells and Charcoal-Leyden crystals are reported if present.

Billing Information

Fee Codes

CPT Code

87177 O&P Exam, 87209 Trichrome Stain


10704-5 OPE, 43227-8 TRIFEE

Have More Billing Questions?

Explore our helpful billing resources:

Billing Resources

Billing FAQ