Test Catalog

Test ID: AERMC    
Aeromonas Culture, Feces

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

Determining whether Aeromonas species may be the cause of diarrhea


This test is generally not useful for patients hospitalized more than 3 days because the yield from specimens from these patients is very low, as is the likelihood of identifying a pathogen that has not been detected previously.

Testing Algorithm Delineates situations when tests are added to the initial order. This includes reflex and additional tests.

When this test is ordered, the reflex tests may be performed and charged separately.


See Laboratory Testing for Infectious Causes of Diarrhea in Special Instructions.

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

Diarrhea may be caused by a number of agents, including bacteria, viruses, parasites, and chemicals; these agents may result in similar symptoms. A thorough patient history covering symptoms, severity and duration of illness, age, travel history, food consumption, history of recent antibiotic use, and illnesses in the family or other contacts will help the healthcare provider determine the appropriate testing to be performed.


Aeromonas species are associated with a range of diarrheal presentations including acute secretory diarrhea with vomiting, chronic diarrhea lasting more than 10 days, and traveler’s diarrhea. Most cases of Aeromonas-associated diarrhea are self-limited and may be managed with supportive therapy (eg, rehydration), but in severe cases or those in patients with a history of immunosuppression, antimicrobial therapy may be considered. Clinical studies have demonstrated differences in antimicrobial susceptibility profiles between Aeromonas species, highlighting the importance of both species identification and susceptibility testing for all isolates, particularly in serious infections.

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 of pathogen

Interpretation Provides information to assist in interpretation of the test results

The growth of Aeromonas species identifies a potential cause of diarrhea.

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

The yield of Aeromonas species is reduced when specimens are delayed in transit to the laboratory (>2 hours from collection for unpreserved specimens).


Check local public health requirements, which may require submission of isolates to a public health laboratory.

Clinical Reference Recommendations for in-depth reading of a clinical nature

1. Pillai DR: Fecal culture for aerobic pathogens of gastroenteritis. In Clinical Microbiology Procedures Handbook, Fourth edition. Washington, DC, ASM Press, 2016, Section 3.8.1

2. Pillai DR: Fecal culture for Campylobacter and related organisms. In Clinical Microbiology Procedures Handbook, Fourth edition. Washington, DC, ASM Press, 2016, Section 3.8.2

3. DuPont HL: Persistent diarrhea: A clinical review. JAMA 2016;315(24):2712-2723 doi:10.1001/jama.2016.7833

Special Instructions Library of PDFs including pertinent information and forms related to the test