Why would a doctor order an arterial blood gas test? Does an electrolyte panel with total carbon dioxide from a vein give the same results? And what is the difference in testing from an artery versus a vein?
Why do physicians order for an arterial blood gas (ABG)? Allow me to cite this url http://www.healthline.com/galecontent/blood-gas-analysis:
"An ABG analysis evaluates how effectively the lungs are delivering oxygen to the blood and how efficiently they are eliminating carbon dioxide from it. The test also indicates how well the lungs and kidneys are interacting to maintain normal blood pH (acid-base balance). Blood gas studies are usually done to assess respiratory disease and other conditions that may affect the lungs, and to manage patients receiving oxygen therapy (respiratory therapy). In addition, the acid-base component of the test provides information on kidney function."
Here are the elements that one can derive from an ABG:
partial pressure of oxygen (PaO2): 75–100 mm Hg
partial pressure of carbon dioxide (PaCO2): 35–45 mm Hg
oxygen content (O2CT): 15–23%
oxygen saturation (SaO2): 94–100%
bicarbonate (HCO3): 22–26 mEq/liter
As for the difference between venous blood gas(VBG) and arterial blood gas, the oxygen saturation will be definitely higher in the arterial blood gas. However, in other elements it has been shown in studying patients with chronic obstructive lung disease that "VBG analysis can reliably predict the ABG values of pH, PCO2 and HCO3 in patients with chronic obstructive lung disease."
Copyright 1994-2016 MedHelp International. All rights reserved.
MedHelp is a division of Aptus Health.
This site complies with the HONcode standard for trustworthy health information.
The Content on this Site is presented in a summary fashion, and is intended to be used for educational and entertainment purposes only. It is not intended to be and should not be interpreted as medical advice or a diagnosis of any health or fitness problem, condition or disease; or a recommendation for a specific test, doctor, care provider, procedure, treatment plan, product, or course of action. Med Help International, Inc. is not a medical or healthcare provider and your use of this Site does not create a doctor / patient relationship. We disclaim all responsibility for the professional qualifications and licensing of, and services provided by, any physician or other health providers posting on or otherwise referred to on this Site and/or any Third Party Site. Never disregard the medical advice of your physician or health professional, or delay in seeking such advice, because of something you read on this Site. We offer this Site AS IS and without any warranties. By using this Site you agree to the following Terms and Conditions. If you think you may have a medical emergency, call your physician or 911 immediately.