# Diagnostic Test Calculator

> Calculates diagnostic test accuracy, sensitivity, specificity, and post-test probability. (iPhone/iPad app by Horizon Strategic Partners Ltd.)

- Source: https://appshunter.io/ios/app/diagnostic-test-calculator/id576357277 (this page in markdown: same URL + `.md`)
- Developer: [Horizon Strategic Partners Ltd](https://appshunter.io/developer/447171789)
- Category: Medical
- Price: Free
- Rating: 1.00/5 from 1 App Store ratings · 1 written reviews indexed
- Age rating: 17+
- Requires: iOS 8.0 · 12 MB
- Languages: American English
- Released: 2012-11-14
- Data updated: 2026-06-10
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/diagnostic-test-calculator/id576357277/reviews.md

## What is Diagnostic Test Calculator?

About the Diagnostic Test Calculator

This diagnostic test calculator is of value to clinicians and researchers who wish to understand the accuracy and reliability of a diagnostic test. The application can determine test characteristics including specificity, sensitivity and likelihood ratio. Easy to navigate input fields allow the user to analyse a diagnostic test quickly and effectively.

The results of the diagnostic test calculator display the post-test probability of disease given the pre-test probability of the characteristics of the specific diagnostic test. Results are shown as absolute values and also as an easy to use graph (nomogram) and summary table.

The app gives you a clear analysis and also, given a sample size, will show the confidence intervals clearly. The nomogram itself will display the probability that the patient actually has the disease after a positive or negative test.

This Diagnostic Test Calculator iPhone application is supported by a grant from Gilead Sciences Europe.

The calculations within the app are based on the open source implementation which can be found at http://araw.mede.uic.edu/cgi-alansz/testcalc.pl (Copyright (c) 2002-2007 by Alan Schwartz alansz@uic.edu).

Instructions

To get started, please input data into the fields provided. The nomogram will be shown with the correct plotted data once the “save” button is pressed.

Date of preparation: June 2012
Job Code: 131/IHQ/12-07//1350

## Key features

- Calculate specificity and sensitivity
- Determine likelihood ratios
- Analyze post-test probability
- Display results as graphs (nomogram)
- Show confidence intervals
- Generate summary tables

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/diagnostic-test-calculator/id576357277/reviews.md

### 1/5 — Broken, broken- Needs to be looked at by the authors

*2022-04-03*

The all important “SAVE” button has vanished from this version of the app.  The likelihood ratio is never calculated.

## Frequently asked questions about Diagnostic Test Calculator

### What is the Diagnostic Test Calculator used for?

The Diagnostic Test Calculator helps clinicians and researchers understand the accuracy and reliability of diagnostic tests by calculating characteristics like specificity, sensitivity, and likelihood ratios.

### What kind of results does the Diagnostic Test Calculator provide?

It displays post-test probability of disease given pre-test probability, as absolute values, a nomogram graph, and a summary table. It also shows confidence intervals.

### Is the Diagnostic Test Calculator free to use?

Yes, the Diagnostic Test Calculator is available for free.

### What devices does the Diagnostic Test Calculator support?

The Diagnostic Test Calculator is supported on iPhone, iPad, and iPod.

### What is the age rating for the Diagnostic Test Calculator?

The Diagnostic Test Calculator has an age rating of 17+.

### How often is the Diagnostic Test Calculator updated?

The latest version, 2.0, was released on January 12, 2017. The app has not been updated since then.

### Does the Diagnostic Test Calculator have ads?

No, the Diagnostic Test Calculator does not contain advertisements.

### What is the user feedback on the Diagnostic Test Calculator?

Based on the available data, the app has a rating of 1.0 stars from 1 rating.

## Version history (last 3 releases)

### 2.0 — 2017-01-12

This app has been updated by Apple to display the Apple Watch app icon.

Layout updates, 
Auto-scroll for nomogram, 
Calculation bug fix

### 1.15 — 2012-11-21

Performance optimisations.

### 1.0 — 2012-11-14

No release notes.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*