NORCET 5 mains: A nurse needs to obtain ABG sample in a client who is on oxygen with a non-rebreather mask (NRBM). How would…

NORCET 5 mains

Medical & Surgical Nursing

Medium

Appeared in: NORCET 5 mains

Explanation

An ABG test is performed to evaluate the effectiveness of the current respiratory support being provided to the patient.
Changing the oxygen delivery device or flow rate before sampling would provide an inaccurate picture of the patient's oxygenation and ventilation status on their prescribed therapy.
The result would not reflect the patient's response to the non-rebreather mask, making it useless for guiding clinical decisions about their care.
It is standard and essential nursing practice to document the patient's exact oxygen therapy (device and flow rate/FiO2) at the time of the blood draw to ensure accurate interpretation of the results.

Option A: Shifting to a nasal cannula would drastically lower the Fraction of Inspired Oxygen (FiO2), leading to an inaccurate ABG result that does not reflect the patient's condition while on the NRBM.
Option B: Decreasing the flow rate on an NRBM is dangerous. It would lower the delivered FiO2 and could cause the reservoir bag to collapse, leading to the rebreathing of carbon dioxide and worsening hypoxia.
Option D: This action is extremely dangerous and contraindicated. A patient requiring an NRBM is likely severely hypoxemic, and removing their oxygen support could precipitate acute respiratory failure or cardiac arrest.

Clinical Relevance

Nursing practice connection: Knowing Arterial Blood Gas (ABG) sampling procedure on a patient receiving high-concentration oxygen therapy helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Accurate ABG results are critical for making decisions about a patient's respiratory management, including whether to escalate (e.g., to mechanical ventilation) or de-escalate oxygen therapy.
Always document the FiO2 or the specific oxygen device and flow rate on the ABG lab requisition form so the results can be interpreted correctly in context.
What if? If the physician wants to assess if the patient can be weaned from the NRBM, they might order a 'weaning trial'. This would involve switching the patient to a lower-flow device for a set period (e.g., 20-30 minutes) before the ABG is drawn. This must be based on a specific physician's order and is not a routine nursing decision.

How to Approach the Question

First, identify the core task in the question: obtaining an ABG sample.
Next, note the patient's specific context: they are on a non-rebreather mask (NRBM), which you should recognize as a high-concentration oxygen delivery device.
Consider the fundamental purpose of an ABG test in this scenario: to assess the patient's current respiratory status on their prescribed therapy.
Evaluate each option based on this purpose. Ask yourself: 'Would this action give an accurate reading of the patient's status on the NRBM?'
Eliminate options that alter the therapy (shifting devices, changing flow) because they would produce inaccurate results. Eliminate options that are clearly unsafe (removing oxygen from a dependent patient).
Conclude that the correct action is the one that maintains the current therapy to get a true and clinically useful measurement.

Concept Tested & Keywords

Concept Tested: Arterial Blood Gas (ABG) sampling procedure on a patient receiving high-concentration oxygen therapy.
Stem keywords: ABG sample, non-rebreather mask, NRBM, oxygen
Lead-in keywords: How would the nurse
Negative lead-in flag: false

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