What is this test?
An antimicrobial susceptibility test assesses an isolated microorganism against selected antimicrobial medicines. It is normally performed after culture and isolation, not as a stand-alone patient test.
Why might it be ordered?
- To support treatment selection when a clinically relevant microorganism has been isolated.
- To assess resistance within the laboratory and clinical context.
What sample is needed?
A separate patient specimen is usually not needed solely for susceptibility testing; it is performed on an isolate from the original specimen. Confirm this with the laboratory.
How should you prepare?
Follow the instructions for the original microbiology specimen and report antibiotics already taken. Do not stop or start antimicrobial treatment on your own.
How should you understand the result?
The report classifies the isolate against tested medicines under applicable laboratory rules. It supports but does not replace the clinician's choice of medicine, dose, and duration.
Sources and editorial status
This patient-facing text is an editorial draft. It should be approved by a laboratory physician before official publication.