The venturi system delivers oxygen concentrations in the range of?

The venturi system delivers oxygen concentrations in the range of?

• A. 40-60%
• B. 60-80%
• C. 24-40%
• D. 80-100%

Answer: (C)

Venturi masks deliver a precise oxygen concentration by using fixed orifices that control how much ambient air is entrained as pure oxygen flows in. The different adapters set specific FiO2 values, and in standard sets the available fractions are 24%, 28%, 31%, 35%, and 40%. Because of these fixed options, the practical range you can deliver with a typical venturi system is about 24% to 40%. Higher Fractions like 60% are achieved with other devices (not the venturi system), such as a non-rebreather mask with a reservoir, which is why the 24–40% range is the correct one.

Venturi masks deliver a precise oxygen concentration by using fixed orifices that control how much ambient air is entrained as pure oxygen flows in. The different adapters set specific FiO2 values, and in standard sets the available fractions are 24%, 28%, 31%, 35%, and 40%. Because of these fixed options, the practical range you can deliver with a typical venturi system is about 24% to 40%. Higher Fractions like 60% are achieved with other devices (not the venturi system), such as a non-rebreather mask with a reservoir, which is why the 24–40% range is the correct one.