Which tests measure Antimicrobial Susceptibility Testing?

Antimicrobial Susceptibility Testing is measured in 1 test on BiomarkersLabs.com, including Bacteriology Culture/Sensitivities.

Biomarker Reference · AST

What does the Antimicrobial Susceptibility Testing test measure?

Q: What is the reference range for Antimicrobial Susceptibility Testing?

The standard reference range for Antimicrobial Susceptibility Testing is Isolate-specific; reported as susceptible (S), intermediate (I), or resistant (R) to each tested agent according to CLSI or EUCAST interpretive criteria.. Reference ranges vary by laboratory and assay platform — interpret in context of the issuing laboratory's stated range.

Antimicrobial Susceptibility Testing (AST) is a clinical biomarker used in infectious-disease assessment. Susceptibility testing measures the in-vitro activity of antimicrobials against a recovered isolate, typically by disc diffusion or automated broth microdilution. It is measured in 1 laboratory test on BiomarkersLabs.com.

Reference Range: Isolate-specific; reported as susceptible (S), intermediate (I), or resistant (R) to each tested agent according to CLSI or EUCAST interpretive criteria.
Units: susceptible/intermediate/resistant classification, minimum inhibitory concentration (µg/mL)
Measured In: 1 test
Category: Infectious Disease

Functional medicine optimalNot applicable — AST is reported per isolate and interpreted in the clinical context; 'optimal' is susceptibility to first-line agents with minimal collateral resistance.

What is Antimicrobial Susceptibility Testing?

Susceptibility testing measures the in-vitro activity of antimicrobials against a recovered isolate, typically by disc diffusion or automated broth microdilution. Results are interpreted against breakpoints that predict clinical response and correlate with the pharmacodynamics of each drug and infection site. Testing panels are chosen according to the organism identified and local resistance epidemiology.

Why is Antimicrobial Susceptibility Testing measured?

Susceptibility data allow practitioners to select an effective agent, de-escalate empirical broad-spectrum therapy, and avoid drugs likely to fail. For public health surveillance, resistance patterns inform empirical guidelines and track the emergence of multidrug-resistant strains.

Reference ranges

Standard reference: Isolate-specific; reported as susceptible (S), intermediate (I), or resistant (R) to each tested agent according to CLSI or EUCAST interpretive criteria.
Functional medicine optimal: Not applicable — AST is reported per isolate and interpreted in the clinical context; 'optimal' is susceptibility to first-line agents with minimal collateral resistance.
Units: susceptible/intermediate/resistant classification, minimum inhibitory concentration (µg/mL)

Reference ranges vary by laboratory and assay platform. Interpret in context of the issuing laboratory's stated range.

Tests that measure Antimicrobial Susceptibility Testing

1 test on BiomarkersLabs.com include this biomarker.

BML-INF-081Comprehensive

Bacteriology Culture/Sensitivities

Antimicrobial Susceptibility Testing reference range in this test: Isolate-specific; reported as susceptible (S), intermediate (I), or resistant (R) to each tested agent according to CLSI or EUCAST interpretive criteria.

Related clinical conditions

Related Biomarkers

Frequently measured alongside

Pathogenic Bacterial IsolatesCulture1 test

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