Setting analytical performance specifications based on outcome studies - is it possible?

Area of Science:

• Clinical Chemistry
• Laboratory Medicine
• Health Outcomes Research

Background:

• The 1999 Stockholm hierarchy for analytical performance specifications (APS) is being revised.
• A simplified, outcome-based model is proposed to replace the top two levels of the existing hierarchy.

Purpose of the Study:

• To review the necessity of outcome-based APS.
• To discuss relevant outcomes, challenges, and limitations in setting these specifications.
• To explore methods for translating outcome data into APS.

Main Methods:

• Review of existing literature and proposed models for APS.
• Discussion of direct (1a) and indirect (1b) outcome studies.
• Explanation of techniques like linked evidence, simulation, and decision analysis for translating outcome data.

Main Results:

• Outcome-based APS should prioritize patient clinical needs and be tailored to the test's role in a clinical pathway.
• Specifications should aim for net health benefit at reasonable costs.
• Direct outcome evaluations are challenging but serve as the benchmark for other APS setting methods.

Conclusions:

• Setting APS based on patient outcomes enhances the clinical and cost-effectiveness of laboratory tests.
• A clearer link between test performance and health outcomes is crucial for defining appropriate analytical performance criteria.
• Outcome-based APS represent the ideal standard, with other methods serving as approximations.