# ABG Expert

> Physician-designed tool for accurate, flexible acid-base analysis. (iPhone/iPad app by Brian Dale Vander Werf MD Inc.)

- Source: https://appshunter.io/ios/app/abg-expert/id885575488 (this page in markdown: same URL + `.md`)
- Developer: [Brian Dale Vander Werf MD Inc](https://appshunter.io/developer/1521935908)
- Category: Medical, Education
- Price: Free
- Rating: 4.80/5 from 9 App Store ratings · 3 written reviews indexed
- Age rating: 12+
- Requires: iOS 13.0 · 2 MB
- Languages: American English
- Released: 2014-06-22
- Data updated: 2026-06-09
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/abg-expert/id885575488/reviews.md

## What is ABG Expert?

ABG Expert™ is simply the best acid-base analysis tool with features available in no other app. Designed and tested by practicing physicians, ABG Expert is trusted by medical professionals for unparalleled accuracy, flexibility, and power while remaining completely intuitive to use. 


Whether you are a physician, nurse, respiratory therapist, paramedic, or student, ABG Expert is your ideal acid base analysis app. 




Accuracy- 

• ABG Expert has been validated using extensive testing under real-world conditions.

• No need to worry about entering physiologically impossible data by mistake. Data is checked for plausibility and for internal consistency using the Henderson-Hasselbalch equation.

• An accurate analysis depends on an accurate anion gap. ABG Expert has you covered with automatic correction of the anion gap when albumin is provided. 

• Never again wonder about how a result was obtained. Detailed explanations include easy-to-understand equations so you can be sure the calculations are correct. 


Flexibility- 

• Need the arterial blood gas analysis, but not the anion gap or A-a gradient? No problem. ABG Expert can analyze the data for all three results separately or together. 

• Set the normal anion gap range based on the normal range at your institution. Or, use your patient’s own baseline anion gap to maximize your sensitivity to detect disorders. 

• Caring for an 80-year-old patient in Denver? Provide age and barometric pressure, and ABG Expert automatically adjusts interpretation of the A-a gradient.  

• Need more specificity? Adjust the normal delta gap range based on the literature you follow in your practice. 

• ABG Expert works as well in Bangkok as it does in Boston with full support for SI and non-SI units. 


Power- 

• Color-coded results allow for rapid analysis in critical situations. One additional click gives you a detailed differential diagnosis and additional recommendations. 

• Concerned about a new problem in your patient with advanced COPD? ABG Expert can adjust its calculations for chronic respiratory conditions so you can detect additional disorders that are missed by other apps. 

• Detailed explanations of disorders integrate ABG, anion gap, and A-a gradient results providing individualized answers like no textbook can. 

• Refine your differential diagnosis even further with the included osmolal gap and urine anion gap calculators.

• ABG Expert combines beauty and brains with optimization for iOS devices running iOS 13 and later. 


Disclaimer: 
Brian Dale Vander Werf MD Inc. has made every effort to ensure the accuracy of the information included in this product. However, the authors, developers, and Brian Dale Vander Werf MD Inc. are not responsible for errors or omissions or for any consequences from the use of this product and make no warranty, expressed or implied, with respect to the currency, completeness, or accuracy of the contents of this product. This product has been designed as a supplemental source of information for medical professionals. This product is not a substitute for clinical judgment, and the use of the information produced by this product in a particular situation remains the responsibility of the medical professional. 

Privacy Policy: 
This product does not collect, store, or transmit individually identifiable health information.

References:
NEJM. 2014; 371: 1434.
Medicine. 1980; 59(3): 161.
Kidney International. 2009; 76: 1239. 
Emerg Med. 1990; 19: 1310.
Clin J Am Soc Nephrol. 2007; 2: 162.
Nat Rev Nephrol. 2010; 6: 274. 
Anaesthesia. 2008; 63: 294. 
Clin J Am Soc Nephrol. 2012; 7: 671.
The ICU Book. 3rd ed. Lippincott Williams & Wilkins; 2007.

## Key features

- Validated accuracy with real-world testing
- Plausibility checks for physiologically impossible data
- Automatic anion gap correction with albumin
- Detailed explanations with equations
- Separate or combined analysis of ABG, anion gap, A-a gradient
- Customizable normal ranges for anion gap and delta gap
- Age and barometric pressure adjustments for A-a gradient
- Support for SI and non-SI units
- Color-coded results and differential diagnoses
- Adjustments for chronic respiratory conditions

## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/abg-expert/id885575488/reviews.md

### 5/5 — Amazing ABG app

*2015-10-25, version 2.1*

I'm an anesthesia resident and love this app. It is easy to use and calculates the things I want to know while providing spot on interpretations as well. I highly recommend to anyone who is learning to interpret blood gases or uses them frequently. Great for anesthesia and critical care!

### 5/5 — Great App!

*2015-04-02, version 2.1*

You know, I was skeptical about this app... But being a simple minded orthopedic resident who really doesn't understand such complex biochemistry this app saved my skin while on the trauma ICU rotation. I used it daily. I can also use this app when I'm down in the ER doing a consult and don't want to have to admit an old patient with maybe one or two medical problems to my service... I just punch in the numbers it asks for and then BAM- Medicine admit!

### 5/5 — BEST ABG APP!!!!!!!!!!

*2014-07-05, version 1.1*

This is by far the best ABG application I've used. The detail in the programming and the user friendly nature of the app are superb. And for the price this is one of the best apps I've ever purchased. The designer is truly superb.

## Frequently asked questions about ABG Expert

### What is ABG Expert used for?

ABG Expert is a medical tool designed for accurate and flexible acid-base analysis. It helps healthcare professionals interpret arterial blood gas results, calculate anion gaps, and analyze A-a gradients with detailed explanations and customizable parameters.

### Who developed ABG Expert?

ABG Expert was designed and tested by practicing physicians and is developed by Brian Dale Vander Werf MD Inc. It aims to provide unparalleled accuracy and power while remaining intuitive for medical professionals.

### Is ABG Expert accurate?

Yes, ABG Expert has been validated using extensive testing under real-world conditions. It includes plausibility checks for data and uses the Henderson-Hasselbalch equation to ensure internal consistency and accurate calculations.

### Can ABG Expert be customized?

ABG Expert offers significant flexibility. You can set normal anion gap ranges based on your institution or patient's baseline, adjust the normal delta gap range, and provide age and barometric pressure to automatically adjust the A-a gradient interpretation.

### Does ABG Expert support different units?

Yes, ABG Expert fully supports both SI and non-SI units, making it usable globally. It works effectively in various locations, from Boston to Bangkok.

### What additional calculators are included in ABG Expert?

In addition to core acid-base analysis, ABG Expert includes an osmolal gap calculator and a urine anion gap calculator. These tools help refine differential diagnoses further.

### What devices is ABG Expert available on?

ABG Expert is optimized for iOS devices running iOS 13 and later. It is compatible with iPhone, iPad, and iPod.

### How often is ABG Expert updated?

The latest version of ABG Expert is 3.4, and it was last updated on July 7, 2025. This indicates regular updates to maintain functionality and accuracy.

## Version history (last 5 releases)

### 3.4 — 2025-07-07

Minor UI improvements.

### 3.3 — 2021-06-29

Minor bug fixes.

### 3.2 — 2020-11-21

This version corrects an issue for users that use a comma as a decimal separator.

### 3.1 — 2020-07-08

Version 3.1 consists of minor user interface improvements and bug fixes.

### 3.0 — 2020-07-07

Version 3.0 consists of major updates for compatibility with iOS devices running iOS 13 and later. There are also minor user interface improvements.

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## More apps by Brian Dale Vander Werf MD Inc

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All apps by Brian Dale Vander Werf MD Inc: https://appshunter.io/developer/1521935908

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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 2026-06-09.*