What percentage concentration of oxygen does a Venturi mask typically deliver?

A Venturi mask is a type of oxygen delivery device that is designed to deliver a precise concentration of oxygen to a patient. The unique feature of the Venturi mask is its ability to mix oxygen with ambient air, which allows for a more controlled and consistent concentration of oxygen. The concentration of oxygen delivered is variable because it depends on the color-coded tips that can be attached to the mask, as each tip design has a different flow rate and consequently delivers a specific percentage of oxygen. This adaptability makes the Venturi mask particularly useful in clinical settings where accurate oxygen delivery is essential for patient management, especially in conditions such as COPD where over-oxygenation can pose risks.

The other choices imply specific fixed percentages for the oxygen delivery, which do not capture the essence of how a Venturi mask operates. Instead, the focus on its variable delivery, based on the specific tip used, accurately reflects the functionality of this device.