What should a nurse explain to a client about the function of a nasal cannula for oxygen therapy?

The function of a nasal cannula is to provide supplemental oxygen to patients who require additional oxygen to maintain adequate blood oxygen levels. By explaining that it "delivers the low concentration of oxygen you need," the nurse accurately conveys that a nasal cannula typically delivers a lower concentration of oxygen compared to more invasive methods, such as a non-rebreather mask or ventilators.

In practice, a nasal cannula typically administers oxygen concentrations ranging from about 24% to 44%, depending on the flow rate. This makes it suitable for patients who do not require high-flow oxygen but still need a boost in their oxygen levels, such as those with mild respiratory issues or during recovery from surgery.

Other options do not accurately represent the function of a nasal cannula. The delivery of high concentrations of oxygen would suggest a more intensive method of support. A nasal cannula does not require a special machine to operate; it simply connects to an oxygen tank or wall supply. Additionally, stating that it is "only used for patients with lung disease" overlooks its broader applicability to any patient needing oxygen therapy, regardless of the underlying condition.