Reference standard $\mathbf{\text{Pre}}-\mathbf{\text{test}}\phantom{\rule{0.25em}{0ex}}\mathbf{\text{prevalence}}=\frac{\mathbf{\text{TP}}\phantom{\rule{0.25em}{0ex}}+\phantom{\rule{0.25em}{0ex}}\mathbf{\text{FN}}}{\mathbf{\text{TP}}\phantom{\rule{0.25em}{0ex}}+\phantom{\rule{0.25em}{0ex}}\mathbf{\text{FP}}\phantom{\rule{0.25em}{0ex}}+\phantom{\rule{0.25em}{0ex}}\mathbf{\text{FN}}\phantom{\rule{0.25em}{0ex}}+\phantom{\rule{0.25em}{0ex}}\mathbf{\text{TN}}}\phantom{\rule{0.25em}{0ex}}$
Administrative data Positive True Positive (TP) False Positive (FP) $\text{PPV}=\frac{\text{TP}}{\text{TP}+\text{FP}}$
Negative False Negative (FN) True Negative (TN) $\text{NPV}=\frac{\text{TN}}{\text{FN}\phantom{\rule{0.25em}{0ex}}+\phantom{\rule{0.25em}{0ex}}\text{TN}}$
$\text{Sensitivity}=\frac{\text{TP}}{\text{TP}\phantom{\rule{0.25em}{0ex}}+\phantom{\rule{0.25em}{0ex}}\text{FN}}$ $\text{Specificity}\phantom{\rule{0.25em}{0ex}}=\phantom{\rule{0.25em}{0ex}}\frac{\text{TN}}{\text{FP}\phantom{\rule{0.25em}{0ex}}+\phantom{\rule{0.25em}{0ex}}\text{TN}}$ $\text{Post}-\text{test}\phantom{\rule{0.25em}{0ex}}\text{Prevalence}=\frac{\text{TP}\phantom{\rule{0.25em}{0ex}}+\phantom{\rule{0.25em}{0ex}}\text{FP}}{\text{TP}\phantom{\rule{0.25em}{0ex}}+\phantom{\rule{0.25em}{0ex}}\text{FP}\phantom{\rule{0.25em}{0ex}}+\phantom{\rule{0.25em}{0ex}}\text{FN}\phantom{\rule{0.25em}{0ex}}+\phantom{\rule{0.25em}{0ex}}\text{TN}}$