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Which arterial blood gas value is most important when determining the effectiveness of oxygen therapy if a client is receiving supplemental oxygen?

Asked by Nicholas, Last updated: Jun 05, 2021

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W. Mocroft

W. Mocroft

Love to do some charity work. Have a passion for writing and do it in my spare time

W. Mocroft
W. Mocroft, Philanthropist, Master Degree in International Business, Las Vegas

Answered Jan 24, 2019

When you are determining whether the patient is receiving enough oxygen, the most important value is the partial pressure of oxygen. It should be about 100 in a normal person. Blood is drawn from an artery so it is freshly oxygenated giving us a measure of the oxygenating power of the lungs.

Even slight changes in the breathing efforts are manifested in the arterial blood gases which makes it a reliable test for detecting the pH of the blood as well as the supplemental oxygen. When the oxygen saturation starts to decrease the patient is unable to sustain his breathing on normal atmospheric oxygen and requires supplemental oxygen. If it does not improve, he needs ventilator support.

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John Smith

John Smith

John Smith
John Smith

Answered Sep 09, 2016

Partial pressure of arterial oxygen (pao2). The most significant and direct indicator of the effectiveness of oxygen therapy is the pao2value. Based on the pao2value, the nurse may adjust the type of oxygen delivery (cannula, venturi mask, or mechanical ventilator), flow rate, and oxygen percentage. the other options reflect the clients ventilation status, not oxygenation.

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