Understanding the Relationship Between Oxygen Flow Rate and FiO2

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There are two important things to consider when delivering supplemental oxygen to your patient: the oxygen flow rate and the FiO². The oxygen flow rate is the number that we dial up on the oxygen flow metre, usually between 1-15L/min. FiO² (the fraction of inspired oxygen) is defined as the percentage or concentration of oxygen that a person inhales.

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What is this article about?

Oxygen - we all need it! Sometimes we need more of it in order to maintain our oxygen saturations. In these situations, supplemental oxygen can be administered via various oxygen delivery devices, ranging from nasal prongs to invasive ventilation.


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Meet the educator

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Joanne Reading
ICU Clinical Educator
Joanne Reading is a clinical educator at the Royal Melbourne Hospital ICU. She holds a critical care graduate certificate and a Master of Health Science, with a focus on education. Joanne is passionate about ensuring that education is entertaining as it fosters critical thinking, and runs her own nursing education website at ‘Blogging for your Noggin’.
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2687 reviews by Ausmed Learners
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Mary Carroll
10 Jan 2021
This was a quick refresher which reinforces the relationship between oxygen flow and fio2 to deliver optimal oxygen saturation’s to your patients. The additional videos are very useful too.
Erin Rangitaawa
21 Apr 2020
Informative thanks
Lynn Hancock
12 Sep 2020
great well resourced article.
Meryl Elliman
17 May 2020
concise and well explained
Louise Bennett
16 Apr 2020
I found this learning resource about oxygen and fiO2 very informative, and helps me to understand that oxygen is a drug that can have dire consequences for a patient if it is misused.
Elli Hum
17 Apr 2020
Lisa Mackay
18 Apr 2020
Concise and good
Julie Carlon
28 May 2023
Registered Nurse
A quick guide to understanding FiO2.
Susan feeney
28 Apr 2021
Informative learning
Annette Holland
12 May 2023
Personal Care Assistant (PCA)
Great knowledge to have
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