What is typically the highest concentration of oxygen achievable with a simple face mask?

The highest concentration of oxygen achievable with a simple face mask is generally around 60%. A simple face mask can deliver a varying concentration of oxygen, typically between 40% to 60% depending on the flow rate of oxygen and the patient’s breathing pattern. This type of mask is designed to cover the nose and mouth and has side ports that allow for exhaled air to escape, which helps to mix with the oxygen being provided from the supply.

When a flow rate is set between 5 to 10 liters per minute, the mask can deliver a concentration of oxygen close to 60%, particularly at higher flow rates. It is important to ensure that the mask fits snugly to minimize the amount of room air dilution, which could decrease the oxygen concentration delivered to the patient.

The other options typically suggest levels that are not achievable under normal circumstances with a simple face mask, reinforcing the correct understanding of oxygen delivery with this type of device.