What are the oxygen delivery levels for a Venturi mask?

The oxygen delivery levels for a Venturi mask are characterized by the specific flow rates and corresponding oxygen concentrations that it can provide to the patient. A Venturi mask is designed to deliver a precise concentration of oxygen, making it especially useful for patients requiring controlled oxygen therapy.

In the case of choice B, the flow rate of 4 to 10 L/min corresponds to an oxygen concentration range of 24% to 50%. This mask utilizes color-coded jet adapters that mix room air with oxygen at controlled ratios to achieve the desired oxygen concentration. This ability to deliver varying levels of oxygen with high accuracy is a key function of the Venturi system, allowing for tailored respiratory support according to patient needs.

This makes choice B the correct selection, as it accurately represents the operational parameters of a Venturi mask in clinical practice. The other options either misrepresent the flow rate or the corresponding oxygen concentration, thereby not aligning with the known specifications for a Venturi mask.