Laboratory Quality and Point-of-Care Testing

This area covers how clinical laboratories assure that the results they report are accurate, reliable, and comparable over time and across sites, and how testing performed near the patient (point-of-care testing) is held to the same standards. It spans the whole testing process - from how a specimen is collected and handled, through how methods are validated and monitored, to how results are interpreted - rather than the chemistry of any single assay.

Definition

Laboratory quality is the body of standards, controls, and validation and monitoring practices by which a clinical laboratory ensures that test results are analytically sound and fit for clinical use across the entire testing process, including testing performed at the point of care.

Scope

The area orients the reader to laboratory quality as a process discipline: the pre-analytical, analytical, and post-analytical phases of the total testing process; quality control and quality assurance; analytical method validation and diagnostic test accuracy; the management of specimen-handling variables; and decentralized point-of-care testing. It treats these as reference and educational topics in laboratory medicine, not as instructions for running a specific laboratory or test.

Sub-topics

• Analytical Validation and Test Accuracy
• Point-of-Care Testing (POCT)
• Pre-Analytical Variables and Specimen Handling
• Quality Control and Quality Assurance

Core questions

• How does a laboratory establish and monitor that a measurement is accurate and reproducible?
• Where in the total testing process do errors most often arise, and how are they controlled?
• How are new or modified analytical methods validated before clinical use?
• How is the same quality assurance extended to testing done outside the central laboratory, at the point of care?

Key concepts

• Total testing process (pre-analytical, analytical, post-analytical phases)
• Quality control and quality assurance
• Analytical validation and verification
• Diagnostic test accuracy (sensitivity, specificity)
• Pre-analytical variability
• Point-of-care testing
• Quality indicators and laboratory error
• Standards and accreditation (e.g. ISO 15189)

Clinical relevance

Because clinical decisions rest on laboratory results, the quality of those results determines whether the information clinicians act on is trustworthy. Studies of laboratory error show that most mistakes arise outside the analytical step - in specimen collection, identification, and handling - which is why quality is framed as a property of the whole testing process. This area describes how that reliability is built and monitored; it is reference material on laboratory practice, not guidance for diagnosing or treating any individual patient.

Evidence & guidelines

Laboratory quality is governed by international standards and professional consensus rather than by a single body of clinical-trial evidence. ISO 15189 sets requirements for quality and competence in medical laboratories, Westgard's multi-rule statistical quality-control framework underpins routine internal quality control, and consensus efforts have worked to harmonize quality indicators across the testing process. Reporting of diagnostic accuracy studies is guided by the STARD statement, covered under the analytical-validation topic.

History

Statistical quality control entered the clinical laboratory in the mid-twentieth century, adapting Shewhart and Levey-Jennings control charts from industrial process control; Westgard's 1981 multi-rule scheme formalized routine internal quality control. Attention later broadened from the analytical step to the full testing process, as work by Plebani and others showed that pre- and post-analytical errors dominate, and international standards such as ISO 15189 codified laboratory quality management.

Key figures

• James O. Westgard
• Mario Plebani
• Giuseppe Lippi

Seminal works

• westgard-1981
• plebani-2009
• plebani-2014

Frequently asked questions

Is laboratory quality only about the testing instrument?

No. Quality is treated as a property of the entire testing process. Much of the error in laboratory medicine arises before analysis - in how specimens are collected, identified, and handled - and after analysis, in reporting and interpretation.

How does point-of-care testing fit into laboratory quality?

Point-of-care testing moves measurement to the bedside or clinic, but it is held to the same quality-control, validation, and oversight standards as central-laboratory testing; this area covers it alongside the core quality topics.