ABMM study materials
ABMM study resources

ABMM case studies

ABMM · Put your knowledge to work in context.

The ABMM (American Board of Medical Microbiology) certification is a professional credential for doctoral-level microbiologists who direct or intend to direct clinical microbiology and public health laboratories. It signals that a candidate can take responsibility for the scientific and administrative operation of a diagnostic microbiology service, not merely perform bench testing. The examination spans the breadth of the discipline: bacteriology, virology, mycology, parasitology, antimicrobial agents and susceptibility testing, laboratory management and administration, molecular diagnostics and emerging technologies, and infection prevention, epidemiology, and public health. Questions are multiple choice and tend to test applied judgment as much as recall, so expect scenarios that ask what a laboratory director would do next rather than isolated facts. The ABMM case studies are 5 cases and about 2,166 words.

1

Blood Culture Contamination and a Central Line

A 340-bed hospital tracks blood culture contamination. Last quarter the overall contamination rate was 3.9% (target <3%).

510 words, about 3 min
2

A Negative Molecular Test in a Patient With Classic Symptoms

A 28-year-old returns from a region with ongoing transmission of an arthropod-borne virus. Five days after symptom onset (fever, arthralgia, a faint maculopapular rash) a serum sample is tested by a laboratory-developed RT-PCR assay.

465 words, about 2 min
3

Susceptibility Reporting When the Automated Panel Is Silent

A 71-year-old in the ICU has a bloodstream infection. The automated susceptibility panel reports the isolate as resistant to the usual first-line agents but gives no result for a reserve agent because that drug is not on the panel.

406 words, about 2 min
4

A Cluster of Pseudo-Outbreaks in the Endoscopy Suite

Over six weeks, three patients who underwent bronchoscopy in the same suite have respiratory specimens growing the same nontuberculous mycobacterium. The isolates have identical susceptibility patterns.

386 words, about 2 min
5

A New Molecular Assay and the Validation Question

A laboratory plans to implement a laboratory-developed multiplex PCR panel for a set of respiratory pathogens. The laboratory has 40 residual clinical specimens, of which 12 are positive for at least one target by a reference method.

399 words, about 2 min