blood gas

a gas, as oxygen or carbon dioxide, that is dissolved in plasma.
a test to determine the pH and concentration of blood gases. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

blood gas n.
Any of the gases that become dissolved in blood plasma, including oxygen, nitrogen, and carbon dioxide.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
blood gas  
Any of the dissolved gases in blood plasma, especially oxygen and carbon dioxide.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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