Sensitivity & Specificity

📊

intermediate

Calculate diagnostic test performance metrics from 2x2 table

Formula

Sens = TP/(TP+FN), Spec = TN/(TN+FP)

Compare two scenarios side-by-side

True Positives

False Positives

False Negatives

True Negatives

Sensitivity

—

Specificity

—

Positive Predictive Value

—

Negative Predictive Value

—

Accuracy

—

Prevalence

—

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All Biology Calculators

About This Calculator & Guide

About the Sensitivity & Specificity

The Sensitivity & Specificity is a dedicated tool in our Biology category designed to help you calculate diagnostic test performance metrics from 2x2 table in seconds. By automating the underlying mathematics, this utility eliminates manual calculations and provides reliable, instantaneous estimations.

Mathematical Principles & Calculation Steps

To compute the results, the calculation engine processes your custom inputs: True Positives, False Positives, False Negatives, True Negatives. Specifically, the calculations are evaluated using the standard relationship: Sens = TP/(TP+FN), Spec = TN/(TN+FP). All computations are performed locally within your secure browser session, ensuring absolute data privacy and instantaneous updates without any network delay.

Worked Step-by-Step Calculation Example

Worked Example Sandbox

For illustrative purposes, consider the following calculation using our default values. When we initialize the input fields with True Positives = 85, False Positives = 10, False Negatives = 15, True Negatives = 90, the client-side calculator processes the numbers to resolve the formula and produce the final outputs: Sensitivity = 85 % and Specificity = 90 % and Positive Predictive Value = 89.474 % and Negative Predictive Value = 85.714 % and Accuracy = 87.5 % and Prevalence = 50 %.

How to Use This Calculator

Set Inputs: Adjust the input values: True Positives, False Positives, False Negatives to match your scenario.
Verify Outputs: The outputs: Sensitivity, Specificity, Positive Predictive Value are updated in real-time on your screen.
Iterate: Change values and compare alternative scenarios to find your optimal result.

Frequently Asked Questions

What does the Sensitivity & Specificity calculator do?+

Calculate diagnostic test performance metrics from 2x2 table It is part of the Biology category on WebCalcSys and provides instant, accurate results. Simply enter your values and the calculator computes the answer in real time — no downloads or sign-ups required.

How do I use the Sensitivity & Specificity calculator?+

Enter the required values (True Positives, False Positives, False Negatives, True Negatives) into the input fields. The calculator processes your data instantly and displays Sensitivity, Specificity, Positive Predictive Value in real time. You can adjust any input to run what-if scenarios.

What formula does the Sensitivity & Specificity calculator use?+

This calculator uses the formula: Sens = TP/(TP+FN), Spec = TN/(TN+FP). It is based on standard biology principles and is trusted by students, professionals, and educators worldwide.