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    NEW! Risk Analysis Guidelines Analysis

    Get an overview of ISO standards 15189, 14971, and 22367 and CLSI guidelines EP18, EP22, and EP23. With Risk Management coming into medical laboratories, now is the time to learn these important Risk Analysis concepts recommended by these documents.

    Introduction to Risk Analysis

    New standards and guidelines for Quality are heading toward the lab, based on Risk Management principles. Learn all about them now.

    Quality Management and Design of Analytical Systems (An Introduction)

    Quality Planning and Design are part of a larger systems approach to analytical management. in this new six lesson course, participants will review current guidelines for quality and learn to use QC Design tools to customize their procedures and achieve the quality required by their tests.

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    Our most popular course, covering the fundamentals of quality control in the laboratory.

    Basic Method Validation

    This course teaches all the experiments and calculations needed for a basic validation of a new instrument. Linearity, Reportable Range, Comparison of Methods, Correlation, Replication, Interference, Recovery, Detection Limit and Reference Range studies are explained and demonstrated. Educational online tools allow participants to enter data and view results immediately.

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    A short animated slide show, narrated by Dr. Westgard, explaining the Inner, Hidden, Deeper, Secret Meaning of Method Validation

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    Everything you ever wanted to know - and were afraid to ask - is included in this online course. All the rules, combinations, and interpretations are included. Online graphing tools allow you to enter data and see the interpretation.

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« Thanks, NCCL! | Main | Pop Quiz: Your QC is on the line... literally »

October 30, 2019


Hassan Bayat (Sina Lab; Qaem Shahr, Iran)

There is another consideration: Do we use 'look-back' approach or not.

If look-back is not used, i.e. R=1, then only the control results from each QC event must be evaluated independent from previous events. In that case, the answer is NO; a violation of the 4:1s rule hasn't happened (on day 2, only 3 results pass 3s at the same side).

On the other hand, if R=2, and therefore we interpret the control results from present and previous QC events collectively, then YES, the 4:1s is violated.

It must be considered that in the case of a R2 look-back approach, the patient results from last run shouldn't be reported until next QC event is passed. This way, if R=n, reporting patient results must be postponed until upcoming n-1 QC events are passed.

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