ISO 17025 LabGuide
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Proficiency Testing Z-Score
Evaluate your laboratory performance by comparing your result against the assigned value.
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/ Z-Score Calculator
Performance Data
Your Laboratory Result ($x$)
Assigned Value ($X$)
Standard Deviation for Proficiency ($SDPA$)
Calculate Z-Score
Z-Score Result
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Interpretation Rules:
|Z| ≤ 2.0
: Satisfactory
2.0 < |Z| < 3.0
: Questionable
|Z| ≥ 3.0
: Unsatisfactory