QC: CV% and Sigma Metric Calculator
Coefficient of variation and sigma score for an assay.
About QC: CV% and Sigma Metric Calculator
Coefficient of variation and sigma score for an assay. The QC: CV% and Sigma Metric Calculator on Picscaler gives you the answer instantly in your browser, with no sign-up.
Inputs: Mean, Standard deviation, Allowable total error (TEa) (%) and Bias (%). Results shown: CV, Sigma metric and Performance.
Formula: CV % = SD / mean x 100; Sigma = (TEa % - |bias %|) / CV %. Use the same unit for mean and SD. TEa comes from your chosen quality specification.
This tool is for education and information. It does not replace clinical judgement, so confirm results against your laboratory's reference ranges and local guidelines.
How to use QC: CV% and Sigma Metric Calculator
- Enter Mean, Standard deviation, Allowable total error (TEa) (%) and Bias (%).
- Press Calculate.
- Read CV, Sigma metric and Performance in the result table.
- Use the formula and notes under the result to check the working.
Frequently asked questions
Is QC: CV% and Sigma Metric Calculator free?
Yes. QC: CV% and Sigma Metric Calculator is completely free to use on Picscaler.
Do I need to create an account?
No. You can use it straight away without signing up.
Is my data safe?
Your input is processed in your browser on your own device and is not uploaded to Picscaler.
Can I use it for medical decisions?
No. It is an educational aid and does not replace professional medical judgement.
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