Tools, Technologies and Training for Healthcare Laboratories

Quality Requirements and Standards

Perspectives on Analytical Quality Management, Part 5

A concluding note on the ongoing debate between the metrological measurement uncertainty approach to quality, and the allowable total error / sigma metric approach. While there is ultimately room for both, when one attempts to abolish the other, there is no alternative but vigorous struggle.

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It's time to talk about bias - is it a shift or an uncertainty?

A key part of the ongoing debate about measurement uncertainty and allowable total error hinges on how we talk about bias. Is bias just another uncertainty like imprecision? Or is it truly a shift, a linear change that cannot be included in uncertainty calculations? Recent metrological approaches have attempted to fudge the answer to this question. But it's time to tackle it head on.

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