Laboratory QC tools
Practical calculators for reviewing control data, analytical performance and measurement uncertainty.
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- QC statistics calculatorSummarise a series of control measurements and calculate statistical control limits. Use a stable, representative data set and your laboratory’s approved review process.
- Westgard rules checkerCompare ordered control results with an assigned mean and SD. The checker identifies statistical patterns; your approved QC procedure determines the response.
- Sigma metric calculatorCombine allowable total error, estimated bias and imprecision on the same percentage scale. Use the result as one input to QC planning, not as a stand-alone acceptance decision.
- Measurement uncertainty calculatorEstimate relative combined standard uncertainty from two components and expand it using a chosen coverage factor. Confirm that this simplified approach fits your laboratory’s uncertainty procedure.
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