Base Excess

Used in assessing acid-base status

The global unit selector only affects unanswered questions
Created by

1. pCO₂

mm Hg
Created by
0/2 completed

About this Calculator

Base excess is defined as the amount of strong acid that must be added to each liter of fully oxygenated blood to return the pH to 7.40 at a temperature of 37°C and a pCO2 of 40 mmHg (5.3 kPa), while a base deficit (ie. a negative base excess) is defined by the amount of strong base that must be added.

The formula for base deficit is as follows:

Base excess = 0.02786 X pCO2 X 10^(pH - 6.1) + 13.77 X pH - 124.58


Siggaard-Andersen O.

An acid-base chart for arterial blood with normal and pathophysiological reference areas.

Scandinavian Journal of Clinical and Laboratory Investigation 1971, 27 (3): 239-45

Legal Notices and Disclaimer

© 2020 QxMD Software Inc., all rights reserved. No part of this service may be reproduced in any way without express written consent of QxMD. This information should not be used for the diagnosis or treatment of any health problem or disease. This information is not intended to replace clinical judgment or guide individual patient care in any manner. Click here for full notice and disclaimer.