Advances in diagnostics for microbial agents: can clinical validation keep pace with the technical promises?

Area of Science:

• Microbiology
• Diagnostic Test Evaluation
• Clinical Epidemiology

Background:

• New diagnostic technologies are emerging rapidly in microbiology.
• Implementation of advanced test evaluation methods remains slow.
• Published studies often conflate analytical accuracy with clinical performance.

Purpose of the Study:

• To highlight the inadequacy of traditional sensitivity and specificity for evaluating new diagnostic tests.
• To emphasize the need for assessing incremental diagnostic value.
• To discuss appropriate methodologies for evaluating diagnostic test impact.

Main Methods:

• Review of current practices in diagnostic test evaluation.
• Argument for multivariable approaches to assess incremental value.
• Discussion on the role of randomized controlled trials (RCTs) for patient outcome assessment.

Main Results:

• Standard sensitivity and specificity metrics are often insufficient.
• Multivariable evaluation may be needed to determine a test's added value.
• RCTs are the gold standard for patient outcomes but not always necessary.

Conclusions:

• Improved collaboration among clinicians, microbiologists, and epidemiologists is crucial.
• Journal editors must enforce established reporting standards for test evaluations.
• Clearer distinction between analytical and clinical performance is essential for accurate test assessment.