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Reference standard: AKIN definition of AKI
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≥2-fold increase in serum creatinine concentration from baseline
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<2-fold increase in serum creatinine concentration from baseline
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Code N17x positive
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True positive (TP)
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False positive (FP)
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Code N17x negative
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False negative (FN)
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True negative (TN)
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- Sensitivity (Sn) = TP ÷ (TP + FN); the proportion of patients with ≥2-fold increase in serum creatinine concentration from baseline who are code N17x positive
- Specificity (Sp) = TN ÷ (FP + TN); the proportion of patients with <2-fold increase in serum creatinine concentration from baseline who are code N17x negative
- Positive predictive value (PPV) = TP ÷ (TP + FP); the proportion of patients who are code N17x positive with ≥2-fold increase in serum creatinine concentration from baseline
- Negative predictive value (NPV) = TN ÷ (FN + TN); the proportion of patients who are code N17x negative with <2-fold increase in serum creatinine concentration from baseline
- Positive likelihood ratio (LR+) = sensitivity/(1-specificity)