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To view specimen requirements and codes please select your laboratory:

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Test Code


CPT Code(s)


Preferred Specimen(s)

Specimen Type STOOL
Specimen State Refrigerated (cold packs)
Patient preparation: For initial diagnostic purposes, no
special patient preparation is required. Patients are not
required to be off of medications or to fast before this
test. While positive test results from patients taking
agents such as proton pump inhibitors and antimicrobials
should be considered accurate, false negative results may
be obtained. For this reason, physicians may suggest the
patient go off medications for two weeks and repeat test if
negative results are obtained.
To confirm eradication, testing should be done at least 4
weeks following the completion of treatment. However, a
positive test result 7 days post therapy is indicative of
treatment failure.
This test is cleared for use with specimens from pediatric

Collect 0.5 mL of semi-solid stool or 20 mm diameter solid
stool and transfer to properly labeled plastic, leak-proof
container. Transport refrigerated (cold packs) up to 3 days.
Frozen if delay exceeds 3 days.

Para-pak clean vial (screw cap vial) is acceptable.

Do not place stool in preservative, transport media or swab.
Watery, diarrheal stool is not acceptable.
NOTE: If received frozen, do not thaw.

Room temperature: Unacceptable
Refrigerated: 72 hours
Frozen: 30 days

Reject Criteria:
Watery, diarrheal stool; Stool in preservative, transport
media or swab; Received room temperature.

Transport Container

Plastic screw cap vial


Immunoassay (IA)

Performing Laboratory


Setup Days


Report Available



There may be possible false-negative results associated with recent PPI use.

Reference Range(s)

Not detected

Clinical Significance

Colonization with H. pylori is associated with increased risk of patients developing gastritis, peptic ulcer disease, and gastric adenocarcinoma. Stool antigen testing provides a sensitive measure of infection including during and after treatment.

LOINC®' Code(s)

The Result and LOINC information listed below should not be used for electronic interface maintenance with Quest Diagnostics. Please contact the Quest Diagnostics Connectivity Help Desk for more information at 800-697-9302.

NOTE: The codes listed in the table below are not orderable Test Codes.

Result NameLOINC CodeComponent Name
Z4540H.PYLORI AG DETECT,EIA,STOOL17780-8Helicobacter pylori Ag

Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.

The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

LOINC assignment is based on a combination of test attributes, including the method used by the performing laboratory. For tests not performed by Quest Diagnostics, codes are assigned by the performing laboratory.

* The tests listed by specialist are a select group of tests offered. For a complete list of Quest Diagnostics tests, please refer to our Directory of Services.