# QABA > Quantitative acid-base analysis tool for medical professionals. (iPhone/iPad app by Calum Donald.) - Source: https://appshunter.io/ios/app/qaba/id872471322 (this page in markdown: same URL + `.md`) - Developer: [Calum Donald](https://appshunter.io/developer/872471325) - Category: Medical, Utilities - Price: Free - Rating: 5.00/5 from 3 App Store ratings · 12 written reviews indexed - Age rating: 12+ - Requires: iOS 12.0 · 5 MB - Languages: American English - Released: 2014-05-06 - Data updated: 2026-06-08 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/qaba/id872471322/reviews.md ## What is QABA? Quantitative Acid Base Analyser Download now and take your Acid Base Analysis to a new and quantitative level! Completely Free! ------------------------------------------------------------------ QABA is designed for Anaesthetic/ICU Consultants and Registrars, but may also be useful for other health and veterinary professionals QABA allows you to enter the blood results and quickly analyse the Acid Base disturbance as per a refinement of the Quantitative Acid Base Analysis introduced by P. Stewart in 1978 The App features: 'swipe' buttons for quick data entry, a colour coded results screen, with a text report & Gamblegram. The App also includes a brief introduction to understanding QABA and a User Guide. Just enter the levels of sodium, potassium, chloride, pH, CO2 and the App will calculate the results of the 3 independent variables that control blood plasma pH; CO2 Strong Ion Difference (SID) and Weak Acids (Atot), NB: Atot requires at least Albumin or Total Protein level. The app will also display the Net Unmeasured Ions (NUI). NUI is an advancement on the Strong Ion Gap used in Stewarts original equations which is comparable to the Anion Gap used in traditional acid base analysis. For added Analysis accuracy QABA can also accept the phosphate, ionised calcium, magnesium, sulphate, lactate, urate, albumin and total protein levels. This App is based on version 11.6 of the P Lloyd 'Quantitative Acid Base Analysis' in use at Hawkes Bay hospital, New Zealand. The App was written by Dr C Donald and supervised by Intensivists Dr M Park and Dr R Freebairn. ------------ Disclaimer Every effort has been made to make this anylser an accurate and useful clinical tool. However the results must be considered alongside the clinical context and the user assumes all liability/responsibility for the clinical decisions made based upon QABA's results ## Key features - Quantitative Acid Base Analysis - Blood result input - Calculates SID, NUI, Atot - Color-coded results screen - Includes User Guide - Supports additional lab values ## Recent user reviews (10 of 12) All indexed reviews: https://appshunter.io/ios/app/qaba/id872471322/reviews.md ### 5/5 — Exceptional tool *2025-07-03, version 1.3* QABA makes quantitative acid base analysis practical and useable for the bedside clinical team . Provides an excellent platform to analysis acid base abnormalities sizing rhe Stewart method ### 5/5 — Quantitative Acid Base Analysis *2022-03-14, version 1.2* A useful app that allows quick calculation of the physio-chemical approach to acid-base at the bedside. ### 5/5 — Stewart approach *2018-03-19, version 1.2* quick to use once you get used to it. Very useful to have this available on the iPhone. Best application I’ve found so far of the Stewart approach ### 2/5 — Doesn't open *2015-12-07, version 1.01* Hey Callum, qaba doesn't open up, keeps crashing ### 5/5 — Great application of the Stewart's approach *2015-03-25, version 1.01* Have been looking for a while how to apply Stewart's at the bedside. Thanks for making qaba available. NUI is also interesting advancement I would like to look into more ### 4/5 — Very convenient way to apply the Stewart's method *2015-01-19, version 1.01* A really useful way to apply the Stewart's approach at the bedside. Thanks! Quirky colours, but the best mobile implementation I've seen so far. ### 5/5 — The best acid-base app *2014-09-26, version 1.01* This is so far the best app for a quick acid base analysis based on Stewart's approach. well designed. Thank you so much ### 5/5 — Essential for any junior ICU trainee *2014-05-07, version 1.0* A quick and easy way to facilitate decisions relating to metabolic disturbance Easy to use and interpret ### 5/5 — Best tool for QABQ *2014-05-07, version 1.0* So useful, great app, easy to use ### 5/5 — Epic *2014-05-07, version 1.0* Has made a huge difference to my practice ## Frequently asked questions about QABA ### What is QABA? QABA is a medical application designed for quantitative acid-base analysis. It allows users to input blood results and analyze acid-base disturbances based on a refinement of P. Stewart's Quantitative Acid Base Analysis. ### Who is QABA for? QABA is primarily designed for Anaesthetic/ICU Consultants and Registrars. It may also be useful for other health and veterinary professionals who need to perform acid-base analysis. ### What information does QABA calculate? QABA calculates the three independent variables that control blood plasma pH: Strong Ion Difference (SID), Weak Acids (Atot), and Net Unmeasured Ions (NUI). It can also accept additional lab values for enhanced accuracy. ### Is QABA free to use? Yes, QABA is completely free to download and use. It does not have any associated costs or in-app purchases. ### What devices does QABA support? QABA is supported on iPhone, iPad, and iPod devices. It is designed for iOS users. ### How often is QABA updated? The latest version of QABA is 1.3, last updated on August 15, 2024. This indicates regular updates to maintain functionality and accuracy. ### Does QABA have ads? No, QABA does not contain advertisements. It is a free application without any ad interruptions. ### What is the age rating for QABA? QABA has an age rating of 12+. This suggests it is suitable for users aged 12 and above. ## Version history (last 4 releases) ### 1.3 — 2024-08-15 Bug Fixes - Updated to run on iOS 12.0 and above ### 1.2 — 2017-03-19 This app has been updated by Apple to display the Apple Watch app icon. *QABA optimized for iPhone 7 *Background Music allowed to continue playing - listen to iTunes and podcasts whilst analysing complex acid base disturbances! *App Launch Failure Bug Fix *Improved App Stability *Minor Bug Fixes ### 1.01 — 2014-05-21 *QABA is now on iPad! *Altered default values to reflect a normal SID (pH now starts at 7.4, Na at 138 and default sample is now arterial) *Minor bug fixes ### 1.0 — 2014-05-06 No release notes. ## Apps similar to QABA | App | Rating | Price | Category | | --- | --- | --- | --- | | [Laboratory Diagnostic Tests](https://appshunter.io/ios/app/laboratory-diagnostic-tests/id1238669077) | 5.0 (12) | Free | Medical | | [SEPSIS 3](https://appshunter.io/ios/app/sepsis-3/id1096128175) | 5.0 (2) | Free | Medical | | [Ferri's Best Test - Lab Guide](https://appshunter.io/ios/app/ferris-best-test-lab-guide/id1243450037) | 4.8 (25) | Free | Medical | | [Manual Lab and Diagnostic Test](https://appshunter.io/ios/app/manual-lab-and-diagnostic-test/id1140859970) | 4.4 (7) | Free | Medical | | [uCentral™ for Institutions](https://appshunter.io/ios/app/ucentral-for-institutions/id301867156) | 4.9 (3,024) | Free | Medical | | [QPS Assay Finder](https://appshunter.io/ios/app/qps-assay-finder/id665640153) | — | Free | Medical | --- *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 2026-06-08.*