EXAM3_WS4_Medical_Decision_Making Flashcards Preview

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Flashcards in EXAM3_WS4_Medical_Decision_Making Deck (8)
1

PREVALENCE

The % of a population that is diseased

Prevalence%=( # Diseased/Total Population) X 100

2

Sensitivity

The percentage of True Positives within a diseased population

SN= TP/diseased or

SN= TP/(TP +FN)

diseased population = TP + FN

3

Specificity

The percentage of True Negatives within a non-diseased population

SP= TN/(TN + FP)

Non-diseased Population= TN + FP

4

Sensitivity vs Specificity

SPin rules the disease IN (if test positive)
SNout rules the disease OUT (if test negative)

5

What type of diseases do you need your test to be 100% Specificity?

Serious UNTREATABLE DISEASES
(you have to be sure- before you tell someone or they might kill themselves)

IE: Huntingtons disease

6

What type of diseases do you need your test to be 100% Sensitivity?

Serious diseases where TREATMENT IS CRITICAL

ie: PKU

7

PPV

Positive Predictive Value
Likelihood a positive test is TRULY POSITIVE

PPV% = TP/total positives x 100
(total positives= TP + FP)

8

NPV

Negative Predictive Value

NPV%= TN/(TN+FN) X 100

Likelihood a negative test is truly negative