---
title: "Alveolar - arterial (A-a) Gradient - Reviews, Revenue and Downloads in India | Apple App Store"
description: "A-a oxygen gradient — The alveolar -  arterial (A-a) oxygen gradient is a measure of oxygen transfer across alveolar capillary membrane (“A” denotes alveolar and “a” denotes arterial oxygenation). It "
---

# Alveolar - arterial (A-a) Gradient — India

![Alveolar - arterial (A App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple69/v4/e3/d1/c1/e3d1c143-e6bc-dc7b-fcab-fb649edcb1df/mzl.atisikfl.png/434x0w.png)

**Developer:** [Satish Deopujari](https://apptail.io/developer/satish-deopujari-FAo)
**Category:** Medical
**Rating:** 5.0/5 (2 ratings)
**Price:** Free
**Bundle ID:** com.persistent.AGE-Tutor
**Store:** Apple App Store
**Country:** India
**Version:** 1.0.5 (released 2016-03-24)
**Original Release:** 2015-07-24
**Languages:** English

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/in/app/app/id996385661)
**AppTail Page:** [https://apptail.io/app/alveolar-arterial-a-a-gradient-APZg/india](https://apptail.io/app/alveolar-arterial-a-a-gradient-APZg/india)

## Alveolar - arterial (A Description
A-a oxygen gradient — The alveolar -  arterial (A-a) oxygen gradient is a measure of oxygen transfer across alveolar capillary membrane (“A” denotes alveolar and “a” denotes arterial oxygenation). It is the difference between the amount of the oxygen in the alveoli.
PAO2 = Alveolar oxygen tension
PaO2 = Arterial oxygen tension
 A-a oxygen gradient = PAO2 - PaO2.

PaO2 is derived from ABG while PAO2 is calculated.
PAO2  =  (FiO2  x  [Patm  -  PH2O])  -  (PaCO2  ÷  R)
FiO2 is the fraction of inspired oxygen (0.21 at room air).
Patm is the atmospheric pressure (760 mmHg at sea level).
PH2O is the partial pressure of water (47 mmHg ).
PaCO2 is derived from ABG , and R is the respiratory quotient. 
(The respiratory quotient is approximately 0.8 at normal physiological state)

A-a gradient varies with age and can be estimated from the following equation, assuming the patient is breathing room air.
A-a gradient = 2.5 + 0.21 x age in years
A-a gradient increases with higher FiO2.
PaO2/FiO2 ratio — The PaO2/FiO2 ratio is a measure of oxygen transfer across the alveolar capillary membrane . Normal PaO2/FiO2 ratio is 300 to 500 mmHg, with values less than 300 mmHg indicating impaired gas exchange and values less than 200 mmHg indicates severe hypoxemia .

Concept By:
Dr. Satish Deopujari
Dr Vivek Shivhare

Disclaimer: This app is based on equations available publicly in Medical domain.  The information contained on this app is intended for educational purposes only. It does not constitute medical advice. You should consult a physician regarding medical diagnosis or treatment.


## Alveolar - arterial (A Rating Breakdown in India
- 5 stars: 2 (100%)
- 4 stars: 0 (0%)
- 3 stars: 0 (0%)
- 2 stars: 0 (0%)
- 1 stars: 0 (0%)

## Alveolar - arterial (A Reviews in India

### ***** "Dr j vegad"
Simply awesome. Makes highly technical issue reasonably simple
-- Jogendra vegad, 2015-08-09

### ***** "User friendly app"
This app is extremely useful.
-- Jayashree Deshpande, 2015-08-08

### ***** "A-a Simplified"
Great app...... It will make life easy for intensive care physicians. That's what technology is for- to make life easier.
-- Mneelesh, 2015-08-07

### ***-- "Simplified app for Neonatal Intensivist"
Neat and clean look. Nice use of blue - red colours hue demonstrating the Oxygen saturation.
-- Nagpurian, 2015-08-03

### ***** "Fantastic app!!"
Working up a patient with hypoxemia couldn't have got simpler! A fantastic app at ur service to get the alveolar arterial gradient within seconds. Perfect for use in ICUs.
-- Dr Amrusha Chouksey, 2015-08-02

### ***** "Dr Anil Jain"
Excellent application for students, nurses and teachers in critical care units. Congratulations Dr deopujari for developing such a wonderful programme.
-- Prestige Nagpur, 2015-07-27

### ***** "Awesome app!"
Wonderfully designed productive app for PICU & NICUs. Need some more like these for the practicing Paediatricians and Neonatologists.
-- Dr Chetan Shende, 2015-07-25

### ***** "Special moment"
This is the only application in the App Store which has simplified the way ABG and other calculations are done . My heartiest congratulations to the developers team and the man behind this Dr Satish Deopujari sir , the gem of our city nagpur !!
-- Imranspecial, 2015-07-24

### ***** "A-a gradient......!!!!"
A splendid app for all intensivist...!!!
A thought provoking app... Understand what we were doing for O2 status, will now change the concept..!!!
-- Dr Buche, 2015-07-24

[View all Alveolar - arterial (A reviews and detailed analytics on AppTail](https://app.apptail.io/signup?utm_campaign=ai-crawl&utm_content=reviews)



## Alveolar - arterial (A Discovered Keywords
- a gradient


## Alveolar - arterial (A Available In
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---

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