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.


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

What’s New

Version 1.2

*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

Ratings and Reviews

5.0 out of 5
3 Ratings

3 Ratings

Icu bod ,

Great application of the Stewart's approach

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

Ltvolk ,

The best acid-base app

This is so far the best app for a quick acid base analysis based on Stewart's approach. well designed. Thank you so much

App Privacy

The developer, Calum Donald, has not provided details about its privacy practices and handling of data to Apple.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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