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Flashcards in Module 10 & 11 Deck (5)
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1

Define "Sensitivity"

The measure of how well a test identifies the presence of a disease when it is present. TP out of all people with disease. SeNsitivity rules OUT (SNOUT). i.e., if a patient tests negative with a sensitive test, we can be more confident that they DON'T have the disease.

2

Define "Specificity"

The measure of how well a test identifies the absence of a disease when it is absent. TN out of all people without disease. SPecificity rules IN. i.e., if a patient tests positive with a highly specific test, it is more likely they actually have the disease.

3

Define "Positive Predictive Value"

TP out of all positives. Defines how well a positive result predicts disease.

4

Define "Negative Predictive Value"

TP out of all negatives. Defines how well a negative result predicts absence of a disease

5

How is the PPV related to prevalence?

The more prevalent a condition, the more greater the PPV is. i.e., if HIV positive in area where HIV endemic , you are more likely to have disease. If HIV positive where little HIV activity, less likely to have disease. Note that when PPV increases, NPV DECREASES.