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Step 6: O₂ – ABG Interpretation (Nursing)

by Rhonda Lawes

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    00:00 Look, we made it, step 6.

    00:04 This one is very straightforward, you look at the O2 .

    00:07 Okay, a PaO2 - that's the partial pressure of oxygen in arterial blood.

    00:13 So normal is 80 to 100 (mmHg), now that's a textbook value.

    00:17 Now keep in mind that's different than an SaO2 I can get an SaO2 or a Sat, it's the measurement of the percentage of how much hemoglobin is saturated with oxygen.

    00:29 So we get that from a pulse ox.

    00:30 We're shooting at 95 to 100% in a perfect world but I want you to really focus on the PaO2, the partial pressure of oxygen in arterial blood.

    00:41 That's a much more reliable measure than a pulse ox but to get van ABG, you have got to stick a patient in an artery.

    00:49 With a pulse ox, I just put a plastic clip on and I can get that number.

    00:53 So we're shooting for 80 to 100 (mmHg).

    00:57 Okay, let's review the 6 steps.

    01:00 We've got number 1 - look at the pH and label it.

    01:03 Number 2 look at the CO2 and label it, Number 3 - look at the bicarb and label it, Number 4 - pH matchup, which label matches the pH label? Then the 5th step, is look at the opposite system and see if it's responding in a way that's appropriate to bring the pH back to normal.

    01:22 So that value in the opposite system has to be outside of the normal range in a way that's helpful to bring that pH back to normal 6th step? Just evaluate the O2.

    01:33 We're looking for a PaO2 that is within 80 to 100 (mmHg) Okay, so let's do a quick review.

    01:41 So you know where you are, whether you're acidosis or alkalosis by looking at the pH.

    01:46 You know who got you there, whose fault it is, it's either the lungs controllling CO2 or the kidneys or metabolic system controlling the bicarb.

    01:55 Then you look at compensation.

    01:57 Is that opposite system acting like a hero? Is it helping that pH get back to within normal? because it's either a respiratory acidosis or alkalosis, metabolic acidosis or alkalosis.


    About the Lecture

    The lecture Step 6: O₂ – ABG Interpretation (Nursing) by Rhonda Lawes is from the course Interpretation of Arterial Blood Gases (ABGs) (Nursing).


    Included Quiz Questions

    1. 80–100 mm Hg
    2. 70–90 mm Hg
    3. 60–80 mm Hg
    4. 35–45 mm Hg

    Author of lecture Step 6: O₂ – ABG Interpretation (Nursing)

     Rhonda Lawes

    Rhonda Lawes


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