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Using a nasal cannula is a common method for delivering supplemental oxygen to patients who require respiratory support. The typical flow rate for a nasal cannula is generally within the range of 1 to 6 liters per minute. This range is considered optimal because it allows for effective oxygen delivery while minimizing the risk of irritation to the nasal mucosa or the potential for over-oxygenation.

When the flow is kept within this range, it provides sufficient oxygen concentration to the patient without leading to potential complications associated with higher flow rates. In contrast, higher flow settings, such as those over 6 liters per minute, can lead to complications such as drying of the nasal passages and may not be tolerated well by patients. Additionally, using flow rates lower than 1 liter per minute is often inadequate for therapeutic use, as it may not provide sufficient oxygen saturation to meet the patient's needs.

Therefore, the range of 1 to 6 L/min is the accepted standard for nasal cannula use in clinical settings, ensuring patients receive adequate oxygen while remaining comfortable.