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Interpretive Handbook

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Test 9388 :
Helicobacter pylori Culture

Clinical Information Discusses physiology, pathophysiology, and general clinical aspects, as they relate to a laboratory test

Helicobacter pylori is a spiral-shaped gram-negative bacterium which may cause chronic gastritis, peptic ulcer disease, and/or gastric neoplasia. In adults of industrialized countries, an estimated 0.5% of the susceptible population becomes infected each year, although the incidence has been decreasing over time. The organism may asymptomatically colonize humans. In suspected Helicobacter pylori-associated disease, the noninvasive stool antigen or urea breath test is recommended. If patients fail to respond to treatment and antimicrobial resistance is suspected, a gastric biopsy, gastric brushings or gastric aspirate may be cultured to attempt to recover the organism for antimicrobial susceptibility testing to assess for resistance.

Useful For Suggests clinical disorders or settings where the test may be helpful

Recovery of Helicobacter pylori from gastric specimens for antimicrobial susceptibility testing of the organism

Interpretation Provides information to assist in interpretation of the test results

A positive result provides definitive evidence of the presence of Helicobacter pylori.

 

Organisms may be detected in asymptomatic (colonized) individuals.

 

False-negative culture results may occur since the organism may die between biopsy collection and laboratory culture.

Cautions Discusses conditions that may cause diagnostic confusion, including improper specimen collection and handling, inappropriate test selection, and interfering substances

Culture-negative results may occur due to the fastidious nature of the organism. Delays in specimen transportation will decrease recovery of the organism. Culture should be set up as soon as possible following specimen collection. Antimicrobial therapy may render the culture negative.

 

Due to Helicobacter pylori's fastidious nature and slow growth, it may take 7 days to recover the organism and up to an additional 21 days to perform antimicrobial susceptibility testing when requested.

Reference Values Describes reference intervals and additional information for interpretation of test results. May include intervals based on age and sex when appropriate. Intervals are Mayo-derived, unless otherwise designated. If an interpretive report is provided, the reference value field will state this.

No growth after 7 days

Clinical References Provides recommendations for further in-depth reading of a clinical nature

1. Versalovic J, Lawson AJ: Helicobacter. In Manual of Clinical Microbiology. 10th edition. ASM Press. Washington DC, 2011, pp 900-915

2. Theel ES: Helicobacter pylori Infection: Test Utilization Strategies for Diagnosis. Mayo Medical Laboratories Communique 2013;38(6):1-8


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