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
Sensitivity
- Characteristics
- Rules Out
- Screening Test
- Formula
- TP / (FN+TP)
2 mins
Specificity
- Characteristics
- Rules In
- Confirmatory Test
- Formula
- TN / (TN + FP)
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
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
1 min
