The Westgard rules are used for laboratory quality control using “runs” consisting of measurements of multiple samples (typically 2-4 samples), called multi-rule. They are based on the Western Electric Rules and Nelson Rules, but are modified for multiple samples in a laboratory setting.

Westgard Rules – Lean Manufacturing and Six…

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The Westgard rules are a set of statistical patterns, each being unlikely to occur by random variability, thereby raising a suspicion of faulty accuracy or precision of the measurement system. They are used for laboratory quality control, in “runs” consisting of measurements of multiple samples.

Westgard rules -…

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Quality Assurance vs Quality Control
Quality assurance is a critical component of a quality management system that are all planned and systematic actions necessary to provide confidence that a product or service will satisfy given requirements for quality. Whereas quality control is the inspection phase or subpart of quality assurance. It is…[Read more]

Accuracy refers to how close a measurement is to the true value, while precision measures the consistency of repeated measurements. Accuracy is influenced by systematic errors, and precision is affected by random errors. Both are essential for reliable data.

What's the difference between accuracy and precision? – Matt Anticole -…

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WHAT IS QUALITY ASSURANCE?
Quality Assurance (QA) is a systematic process that ensures products, services, or processes meet or exceed established quality standards. It involves activities and techniques aimed at preventing defects, identifying and resolving issues, and improving overall quality throughout the entire lifecycle of a product or…[Read more]

Quality control is a reactive process that focuses on identifying and resolving issues that arise in the final product after it has reached consumers. Quality assurance is a proactive process primarily concerned with ensuring quality requirements are met before the product or service is released to the public.

Quality Assurance vs.…

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