What is the common flow rate for a nasal cannula?

The common flow rate for a nasal cannula is typically between 1 to 4 liters per minute (LPM). This range is widely accepted because it provides supplemental oxygen in a manner that is comfortable for the patient while still being effective in increasing oxygen saturation levels. At flow rates within this range, the delivery of oxygen through the nasal passages is adequate for patients who require low-flow oxygen therapy.

When using a nasal cannula, it's important to consider that higher flow rates, while capable of delivering more oxygen, can cause dryness and irritation to the nasal mucosa and may not be comfortable for all patients. Additionally, flow rates above 4 LPM may not effectively increase oxygen concentration in the patient’s bloodstream due to dilution with room air. In contrast, flow rates described in the other options are either too high for a nasal cannula, which is primarily designed for low flow, or too low to meet the typical needs of patients requiring oxygen supplementation.