Sensitivity, Specificity, PPV, NPV

Ability of the test to identify people who DO have the disease

• Sensitivity
• Specificity
• Negative Predictive Value
• Positive Predictive Value
• True Positive

Ability of the test to identify people who do NOT have the disease

• Sensitivity
• Specificity
• Negative Predictive Value
• Positive Predictive Value
• True Negative

Likelihood that the person with a positive test truly has the disease

• Sensitivity
• Specificity
• Negative Predictive Value
• Positive Predictive Value
• False Negative

Likelihood that the person with a negative test truly does NOT have the disease

• Sensitivity
• Specificity
• Negative Predictive Value
• Positive Predictive Value
• True Positive

Patients who truly have the disease and test positive

• True Positive
• True Negative
• False Positive
• False Negative

Patients who truly have the disease but test negative

• True Positive
• True Negative
• False Positive
• False Negative

Patients who do not have the disease and test negative

• True Positive
• True Negative
• False Positive
• False Negative

Patients who do not have the disease but test positive

• True Positive
• True Negative
• False Positive
• False Negative

This is the equation for sensitivity

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Answer explanation

This is the equation for specificity

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Answer explanation