What is the primary function of a nasal cannula?

The primary function of a nasal cannula is to deliver small amounts of additional oxygen to patients who require supplemental oxygen but do not need high concentrations. It consists of two small prongs that insert into the nostrils, allowing oxygen to flow directly into the nasal passages. This method is suitable for patients with mild to moderate hypoxemia, as it provides a convenient and comfortable way to enhance oxygen delivery without completely overwhelming the patient's respiratory system.

While other options may sound relevant to oxygen therapy, they do not accurately describe the main use of a nasal cannula. For example, administering high concentrations of oxygen is typically achieved through other devices like non-rebreather masks. Although nasal cannulas can offer some humidity by delivering the oxygen at room temperature, their primary purpose is not to provide humidity; rather, it's to ensure a steady supply of supplemental oxygen. Furthermore, facilitating suctioning is unrelated to the function of a nasal cannula, as suctioning refers to clearing the airways of secretions and is performed with different equipment, not with a nasal cannula. Thus, the answer reflects the specific and correct usage of this device in clinical settings.