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Giardia/Cryptosporidium Antigen Screen (8000100038)
Test Mnemonic:


Specimen Requirements:
Test Included:

Cryptosporidium antigen

Giardia antigen

Both tests are run on the same testing card so both tests are performed and reported.


Feces and submit in ParaPak preservative containers.


Para Pak container

Minimum Volume:

Fill to indicated lines on Para Pak vials


Room temperature

Specimen Preparation:

ParaPak containers are required


7 days

Causes for Rejection:

Polyvinyl alcohol ( PVA ) preservative only;  colonic washes, aspirates, or other non-stool specimens; unlabeled samples or mislabeled samples, no date and time of collection on requisition form.

Reference Range:


Turnaround Time:

Test is performed daily Monday through Friday


EIA capture membrane assay


Clinical Microbiology


Cryptosporidium assay; Giardia assay; Cryptospordium parvuum test; Giardia lamblia test; Ova and Parasite Exam; Intestinal Parasite Exam; Parasite, Intestinal Test; Cryptosporidium stain

Clinical Indication:

Screening test for the detection of Cryptosporidium and of Giardia  antigens in fecal samples. These test replaces routine ova and parasite  (O&P) examination

Patient Preparation :

Collection of feces into clean container and then transfer to Para Pak vials.

CPT 4 Code:

87328, 87329


EIA antigen detection is more sensitive than O&P microscopy for detection of Giardia and Cryptosporidium. Requests for O&P will be replaced with this test unless patient travel history and immunocompetency are noted on the request form.

When ordering tests for which Medicare or Medicaid reimbursement will be sought, physicians should only order tests that are medically necessary for the diagnosis or treatment of the patient. Components of the organ or disease panels may be ordered individually. The diagnostic information must substantiate all tests ordered and must be in the form of an ICD-10 code or its verbal equivalent.
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