What is the recommended flow range for an oxygen hood?

What is the recommended flow range for an oxygen hood?

• A. 5-8 L/min
• B. 9-12 L/min
• C. 7-14 L/min
• D. 15-20 L/min

Answer: (C)

Oxygen hoods work as an open system, delivering high flow so that exhaled CO2 is flushed out and room air is entrained to set the delivered oxygen fraction. The best balance is achieved with a flow of about 7–14 L/min. This range provides enough washout to minimize CO2 buildup and deliver a useful FiO2 without causing unnecessary turbulence, noise, or mucosal drying from very high flows. Flows lower than this risk rebreathing and lower FiO2 due to more room air entrainment, while flows much higher than this yield diminishing returns and can be uncomfortable for the infant.

Oxygen hoods work as an open system, delivering high flow so that exhaled CO2 is flushed out and room air is entrained to set the delivered oxygen fraction. The best balance is achieved with a flow of about 7–14 L/min. This range provides enough washout to minimize CO2 buildup and deliver a useful FiO2 without causing unnecessary turbulence, noise, or mucosal drying from very high flows. Flows lower than this risk rebreathing and lower FiO2 due to more room air entrainment, while flows much higher than this yield diminishing returns and can be uncomfortable for the infant.