The Joint Committee for Traceability in Laboratory Medicine (JCTLM): a global approach to promote the standardisation of clinical laboratory test results.

Clinical laboratories are moving towards global standardisation to produce equivalent test results across space and time. Standardisation allows use of evidence-based medicine, eliminates the need of method-specific reference intervals, decision levels and cut-offs, and can be achieved by application of metrological principles. For example, in vitro diagnostics (IVD) manufacturers can make kit calibrators traceable to internationally recognised reference materials and reference methods.

A Mimic of the Sick Sinus Syndrome in a Middle-Aged Athlete.

Highly trained athletes may have physiological alterations in cardiac pacemaker and conduction function. This article helps clinicians recognize arrhythmias related to exercise conditioning.