Test Overview

Test Usage

Screening for the detection of Cryptosporidium and Giardia antigens present in stool

Reference Range*

Negative (no detectable Cryptosporidium or Giardia antigen)

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

Test Limitations

This test is approved for stool specimens only.

Test Details

Days Test Performed

Daily; Monday - Friday, except Holidays

Analytic Time

30 minutes

Soft Order Code


MiChart Code

Cryptosporidium and Giardia Antigen



Parasite Antigen, Giardia lamblia
Parasite Antigen, Cryptosporidium

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Specimen Requirements

Offsite Collection Instructions

Collect fresh random stool specimen. Add stool specimen to transport vial until liquid reaches fill line. Emulsify specimen thoroughly in transport fluid. If necessary, place a urine bag on the patient to prevent urine contamination.
Acceptable specimens are stool sent in Stool Culture transport (orange cap) (Cary Blair) stored refrigerated up to 48 hours. If an unacceptable specimen is received, the client will be notified before disposal of the original specimen.
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 too old and/or not stored at the proper temperature.
Specimen received in PVA or other alcohol containing transport.
Patient In-house > 3 days
More than 1 specimen/day
Rectal swabs and diapers


Administration of barium may give a false negative result. Wait until patient has cleared substance (about 7-10 days) before collecting stools for examination.

Normal Volume

5 mL stool

Additional Information

Note: The Gastrointestinal panel (GIPAN) by PCR for Cryptosporidium and Giardia lamblia is more sensitive than the Cryptosporidium and Giardia Antigen enzyme immunoassay (CRGAG). Also, the Cryptosporidium and Giardia Antigen enzyme immunoassay (CRGAG) is more sensitive than Ova and Parasite Exam (OPE) for detection of Cryptosporidium and Giardia infection.

Billing Information

Fee Codes

CPT Code

87328, 87329

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