Giardia lamblia, Direct Detection EIA

CPT: 87329
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  • Stool for Giardia lamblia

Test Includes

Immunoassay for Giardia lamblia

Expected Turnaround Time

2 - 3 days

Related Documents

Specimen Requirements




2 g (thumbnail size portion of stool), 2 mL liquid stool

Minimum Volume

2 g, 2 mL stool in formalin portion of O&P transport kit


O&P transport vial with formalin (Para-Pak® pink) (preferred); sterile screw-cap container or Para-Pak® white


Fecal specimens for parasitic examination should be collected before initiation of antidiarrheal therapy or antiparasitic therapy. The highest yield on hospitalized patients occurs when diarrhea is present on admission or within 72 hours of admission. The onset of diarrhea more than 72 hours after admission is usually caused by Clostridium difficile toxin rather than parasites or the usual stool pathogens. The following recommendations are made for efficient and cost-effective diagnosis of diarrheal disease in patients admitted with gastroenteritis.

• Submit one or two specimens per diarrheal illness immediately. Consider first requesting the EIA for Giardia and Cryptosporidium (see test Cryptosporidium, Direct Detection EIA [183020] or panel Giardia lamblia, Direct Detection EIA and Cryptosporidium, Direct Detection EIA [183558]. Giardia and Cryptosporidium are the most common causes of parasitic gastroenteritis in the United States.

• If EIAs are negative, request add-on testing for Ova and Parasites Examination [008623] and submit an additional stool specimen after five days for O&P examination.

• Also consider testing for unusual stool pathogens (Cyclospora Smear, Stool [183145]), especially in the immunocompromised patient.

Storage Instructions

Maintain specimen in O&P transport with formalin at room temperature or refrigerate and test within 18 months of collection. Stool in sterile container should be frozen, or it can be kept refrigerated if tested within 24 hours.

Causes for Rejection

Inappropriate specimen transport device; specimens in PVA; specimens other than stool; specimens received other than described; inadequate labeling; specimen received after prolonged delay; specimens in Cary Blair medium

Test Details


Rapid detection of Giardia lamblia from clinical samples


Enzyme immunoassay (EIA)


Do not collect specimen for one week after barium or laxative administration.

Reference Interval



Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC
182204 Giardia lamblia Ag, EIA 6412-1 182204 Giardia lamblia Ag, EIA 6412-1

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