Calculating Sensitivity, Specificity and Predictive Values for Medical Diagnostic Tests

Understanding diagnostic tests 1: sensitivity, specificity and predictive values.

UNLABELLED The usefulness of diagnostic tests, that is their ability to detect a person with disease or exclude a person without disease, is usually described by terms such as sensitivity, specificity, positive predictive value and negative predictive value. In this article, the first of the series, a simple, practical explanation of these concepts is provided and their use and misuse discussed...

Statistical Evaluation of Diagnostic Tests (Part 1): Sensitivity, Specificity, Positive and Negative Predictive Values.

I clinical practice, two broad types of tests are usedscreening and diagnostic tests. Screening tests are those that are used on a large population [usually healthy individuals or patients who are yet asymptomatic] to identi fy those likely to need intervention or identify disease early. Examples of screening tests would include routine blood pressure monitoring for diagnosing hypertension, a P...

The Sensitivity, Specificity and Predictive Values of Snellen Chart Compared to the Diagnostic Test in Amblyopia Screening Program in Iran

Introduction Amblyopia is a leading cause of visual impairment in both childhood and adult populations. Our aim in this study was to assess the epidemiological characteristics of the amblyopia screening program in Iran. Materials and Methods A cross-sectional study was done on a randomly selected sample of 4,636 Iranian children who were referred to screening program in 2013 were participated i...

Sensitivity, specificity, predictive values, and likelihood ratios.

part 2: positive and negative predictive values of diagnostic tests

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