Test Overview
Test Methodology

Microscopic Exam

Test Usage

Establish the diagnosis of parasitic infestation

Reference Range *

No parasites seen

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 Set Up
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
  • OPE
  • 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
Specimen Requirements
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 https://mlabs.umich.edu/media/175 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.

Alternate Specimen
Specimens received in Parasafe fixative are acceptable, but EcoFix (supplied by MLabs) is preferred. [1/08]
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
Storage Temperature
Ambient: Yes
Refrigerated: No
Frozen: No
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
Additional Information

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

CPT Code
87177 O&P Exam, 87209 Trichrome Stain
Fee Code
32268 OPE, 32216 TRIFEE
10704-5 OPE, 43227-8 TRIFEE
NY State Approved