Tools, Technologies and Training for Healthcare Laboratories

Biologic Variation Terminology: I before G, except separate from A

Posted by Sten Westgard, MS

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HbA1c: Bias is a big deal, and CV is critical

Posted by Sten Westgard, MS

Two interesting abstracts and papers concerning HbA1c came out recently. As laboratories switch from fasting blood glucose to HbA1c to diagnosis diabetes, the importance of the method performance of HbA1c methods is becoming critical.

But what's more important? Bias or CV?

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Westgard in the News: Shaking up QC Frequency

Posted by Sten Westgard, MS

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A dearth of data in published papers

Posted by Sten Westgard, MS

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Are performance specifications based on biological variation for hemostatis unfit-for-purpose?

Posted by Sten Westgard, MS

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New Paper on Six Sigma models and math

Posted by Sten Westgard, MS

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How the "Westgard Rules" got their name...

Posted by Sten Westgard, MS

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New Paper on MU, TE, and the unnecessary struggle

Posted by Sten Westgard, MS

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Comparing MU to Ricos Desirable CV: Like comparing an apple to basketball

Posted by Sten Westgard, MS

I was looking over a recent study of a compact blood gas analyzer conducted over multiple sites, multiple cartridges, multiple days, etc. In other words, this was a study that was doing a very thorough job.

Then I reached a section where suddenly it all fell to nonsense: measurement uncertainty.

So they calculated measurement uncertainty, but then they compared the results against Ricos desirable imprecision performance specifications.

Huh?

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Pop Quiz: How many equations are needed (at minimum) to calculate measurement uncertainty?

Posted by Sten Westgard, MS

In Biochemia Medica, a recent article detailed the Minimum requirements for the estimation of measurement uncertainty:Recommendations of the joint Working group for uncertainty of measurement of the CSMBLM and CCMB.

Can you guess how many?

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New Paper: Risk-Based QC Strategies with Six Sigma Nomograms

Posted by Sten Westgard, MS

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Are there new (Erna Lenters-)"Westra Rules" for HbA1c?

Posted by Sten Westgard, MS

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Sigma-metrics in Korea PT

Posted by Sten Westgard, MS

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Budgets aren't the only things getting squeezed in the lab...

Posted by Sten Westgard, MS

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Westgard in the News: Advance for the Laboratory Manager, February Issue

Posted by Sten Westgard, MS

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Setting specifications for setting specifications for...

Posted by Sten Westgard, MS

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Congratulations, Dr. Paulo Pereira

Posted by James O. Westgard, PhD

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