Ace Your First Aid for the USMLE Step 1 (2021) Classes and Exams with Picmonic: #1 Visual Mnemonic Study Tool for Physician Assistant (PA) Students

With Picmonic, facts become pictures. We've taken what the science shows - image mnemonics work - but we've boosted the effectiveness by building and associating memorable characters, interesting audio stories, and built-in quizzing. Whether you're studying for your classes or getting ready for a big exam, we're here to help.

First Aid for the USMLE Step 1 (2021) | Physician Assistant (PA) School Study Aid


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Sensitivity
Characteristics
Rules Out
Screening Test
Formula
TP / (FN+TP)
picmonic thumbnail
2 mins
Specificity
Characteristics
Rules In
Confirmatory Test
Formula
TN / (TN + FP)
picmonic thumbnail
1 min
Positive Predictive Value (PPV)
Proportion of Positive Tests that are True Positive
Probability that Person with Positive Test has Disease
Formula
TP (True Positives)
Divided by /
All Positive Test Results
TP + FP
Considerations
Varies Directly with Prevalence
picmonic thumbnail
1 min
Negative Predictive Value (NPV)
Proportion of Negative Tests that are Truly Negative
Probability that Person with Negative Test is Healthy
Formula
(TN) True Negatives
Divided by /
All Negative Test Results
(FN + TN)
Considerations
Varies Inversely with Prevalence
picmonic thumbnail
1 min

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