Sensitivity Calculator
Enter the number of true positives and false negatives to determine diagnostic sensitivity (recall) and interpret test accuracy.
Sensitivity: 90.00%
Formula: TP / (TP + FN)
Positive cases: 50
How to Use This Calculator
- Enter true positives (correctly identified positives).
- Enter false negatives (missed positives).
- Review the reported sensitivity in percentage form.
- Use results to evaluate diagnostic accuracy or classifier recall.
Formula
Sensitivity = TP / (TP + FN)
Represents the true positive rate or recall.
Denominator equals total actual positives.
Full Description
Sensitivity measures the proportion of actual positives that a test correctly identifies. High sensitivity reduces false negatives, crucial for screening serious conditions or detecting rare events.
Frequently Asked Questions
What if there are no positive cases?
Sensitivity is undefined when TP + FN = 0. The calculator warns in this scenario.
How does sensitivity differ from specificity?
Sensitivity addresses positives (true positive rate), while specificity evaluates negatives (true negative rate).
Can sensitivity exceed 100%?
No. Valid inputs ensure sensitivity lies between 0% and 100%.
How do I improve sensitivity?
Adjust test thresholds to catch more positives, potentially at the cost of lower specificity.