Giardia lamblia, EIA and Ova and Parasites Examination

CPT: 87177; 87209; 87329
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Test Details

Synonyms

  • Stool for Ova and Parasites Including EIA for Giardia

Test Includes

Giardia, EIA; O&P exam

Use

Rapid detection of Giardia lamblia; establish the diagnosis of parasitic infection

Limitations

Does not include Pneumocystis carinii, Trichomonas vaginalis, Cryptosporidium, Microsporidium, or Cyclospora. For optimal results, three specimens over a period of five to six days are recommended.

Methodology

Giardia lamblia: enzyme immunoassay (EIA); O & P: concentration with examination of wet preparations and trichrome staining and exam

Contraindications

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

Specimen Requirements

Specimen

Stool

Volume

2 g (thumbnail size portion of stool)

Container

O & P transport/preservative kit with formalin and PVA (Para-Pak® pink and gray)

Collection

Patient should be given three collection kits and be instructed to collect three separate specimens 48 hours apart during a period of five to six days.

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 requesting the EIA for Giardia (see Giardia lamblia, EIA and Ova and Parasites Examination [188110] and Giardia lamblia, Direct Detection EIA [182204]) if that is the primary suspected organism.

• If those are negative, submit an additional specimen after five days.

• Patients who are immunocompromised by AIDS, malignancy, or immunosuppressive therapy may require additional testing for unusual stool pathogens (eg, Cyclospora Smear, Stool [183145]).

Storage Instructions

Maintain specimen at room temperature.

Causes for Rejection

Specimen not submitted in formalin and PVA kit; specimens other than stool; unlabeled specimen or name discrepancy between specimen and test request label; specimen received in expired transport

Clinical Information

Special Instructions

The test request form must indicate special request for Cyclospora species or Cryptosporidium species.

LOINC® Map

Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC
188110 Giardia, EIA, Ova/Parasite 008624 Ova + Parasite Exam 10701-1
188110 Giardia, EIA, Ova/Parasite 182204 Giardia lamblia Ag, EIA 6412-1
Reflex Table for Ova + Parasite Exam
Order Code Order Name Result Code Result Name UofM Result LOINC
Reflex 1 080206 Result 080207 Result 1 10701-1
Reflex Table for Ova + Parasite Exam
Order Code Order Name Result Code Result Name UofM Result LOINC
Reflex 1 080206 Result 080208 Result 2 10701-1
Reflex Table for Ova + Parasite Exam
Order Code Order Name Result Code Result Name UofM Result LOINC
Reflex 1 080206 Result 080209 Result 3 10701-1
Reflex Table for Ova + Parasite Exam
Order Code Order Name Result Code Result Name UofM Result LOINC
Reflex 1 080206 Result 080210 Result 4 10701-1
Reflex Table for Ova + Parasite Exam
Order Code Order Name Result Code Result Name UofM Result LOINC
Reflex 1 080206 Result 080211 Antimicrobial Susceptibility N/A

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