Elementor #10941

QCATLAS QC TOOL

Sigma Metric Calculator

Measure analytical performance using your TEa, bias, and imprecision data.
Sigma = TEa − |Bias| CV
01

Enter performance data

Use percentages for all three values.
%
Must be greater than zero
%
Positive or negative accepted
%
Must be greater than zero
02

Performance position

Your result is mapped to the sigma scale.
SIGMA METRIC —
Awaiting data
Excellent ≥ 6σ
Good 4–<6σ
Marginal 3–<4σ
Poor <3σ
σ —
InterpretationEnter your data to view the analytical performance category.
Important: Sigma is an analytical performance indicator. QC rules and frequency should also reflect clinical risk, method stability, and laboratory policy.

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