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Test Code HPRP Helicobacter pylori with Clarithromycin Resistance Prediction, Molecular Detection, PCR, Tissue


Ordering Guidance


If testing directly from feces is desired, order HPFRP / Helicobacter pylori with Clarithromycin Resistance Prediction, Molecular Detection, PCR, Feces.

 

For more information see Helicobacter pylori Diagnostic Algorithm.



Specimen Required


The high sensitivity of amplification by polymerase chain reaction requires the specimen to be processed in an environment in which contamination of the specimen by Helicobacter pylori DNA is unlikely.

 

Submit only 1 of the following specimens:

 

Specimen Type: Fresh tissue or biopsy

Sources: Stomach (or duodenum)

Container/Tube: Sterile container

Specimen Volume: Entire collection or 5 mm (3) approximate size of a pencil eraser

Collection Instructions:

1. Collect fresh tissue specimen.

2. Submit tissue in a sterile container (without adding anything).

3. Refrigerate or freeze the specimen.

Specimen Stability Information: Refrigerated (preferred) 7 days/Frozen 7 days

 

Preferred:

Supplies: Tissue Block Container (T553)

Specimen Type: Formalin-fixed, paraffin-embedded (FFPE) tissue block

Sources: Stomach (or duodenum)

Container/Tube: Tissue block

Collection Instructions: Submit FFPE tissue block to be cut and returned.

Specimen Stability Information: Ambient (preferred)/Refrigerated

 

Acceptable:

Specimen Type: Formalin-fixed, paraffin-embedded (FFPE) tissue scroll

Sources: Stomach (or duodenum)

Container/Tube: Sterile container for each individual cut section (scroll)

Collection Instructions: Perform microtomy and prepare five separate 10-micron sections. Each section (scroll) must be placed in a separate sterile container for submission.

Specimen Stability Information: Ambient (preferred)/Refrigerated


Useful For

Aiding in the diagnosis of Helicobacter pylori infection and prediction of clarithromycin resistance or susceptibility directly from gastric biopsies

Reflex Tests

Test ID Reporting Name Available Separately Always Performed
TISSR Tissue Processing No No

Method Name

Real-Time Polymerase Chain Reaction (PCR)

Reporting Name

H pylori + Clarithro Resist, PCR

Specimen Type

Varies

Specimen Minimum Volume

Fresh tissue or biopsy: 5 mm(3)
Formalin-fixed paraffin-embedded tissue block: One block
Formalin-fixed paraffin-embedded tissue scroll: Two 10-micron sections

Specimen Stability Information

Specimen Type Temperature Time Special Container
Varies Varies

Reject Due To

Tissue in formalin
formaldehyde, or acetone
FFPE slides		 Reject

Clinical Information

Helicobacter pylori is a cause of peptic ulcer disease and, when left untreated, a risk factor for gastric cancer. H pylori diagnosis includes noninvasive tests (eg, stool polymerase chain reaction [PCR], urea breath test, stool antigen test) and tests requiring endoscopy to collect specimens for analysis. Several tests can be performed on gastric specimens, including H pylori PCR.

 

Antimicrobial resistance in H pylori is poorly studied but is rising, challenging its treatment. Assessment of antimicrobial resistance can guide treatment. Endoscopically collected gastric specimens can be cultured for H pylori and the recovered organism tested for phenotypic antimicrobial susceptibility. However, the organism can be difficult to isolate in culture, and even when isolated, may not amenable to phenotypic susceptibility testing due to its fastidious nature.

 

Clarithromycin resistance is most often associated with 23S ribosomal RNA (rRNA) gene mutations (particularly A2143G, A2142G/C). A systematic review and meta-analysis showed the sensitivity and specificity of detection of the H pylori A2142G/C and/or A2143G combination for prediction of clarithromycin resistance in H pylori in biopsy samples to be 96% each.

 

This test detects H pylori in gastric and duodenal biopsy specimens and, when detected, assesses for H pylori 23S rRNA gene mutations associated with clarithromycin resistance.

Reference Values

Not detected

Day(s) Performed

Monday through Friday

Report Available

4 to 6 days

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Test Classification

This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. It has not been cleared or approved by the US Food and Drug Administration.

CPT Code Information

87798

Forms

If not ordering electronically, complete, print, and send Gastroenterology and Hepatology Test Request (T728) with the specimen.