What type of oxygen should be used for noncritical patients with no respiratory distress?

• A. 100% oxygen via nonrebreather mask.
• B. Only the concentration needed to achieve SpO2 of 92%, typically using a nasal cannula.
• C. No oxygen supply.
• D. Room air only.

Answer: (B)

The key idea is to deliver only the oxygen amount needed to keep the patient’s SpO2 around the target level. For a noncritical patient without respiratory distress, that means titrating supplemental oxygen to reach about 92% SpO2, rather than giving high concentrations. A nasal cannula is ideal here because it provides a low, adjustable FiO2 sufficient to achieve the target without overdosing.

Using 100% oxygen via a nonrebreather mask would be excessive for someone who is stable and not in distress—it increases oxygen delivery beyond what’s needed and can have downsides like oxygen toxicity and unnecessary resource use. If the patient is already at the target SpO2 on room air, you wouldn’t add oxygen; but if supplementation is needed to reach 92%, the minimal, appropriate delivery is through a nasal cannula.