When a child is set to receive 50% oxygen therapy, how should the air entrainment port on the nebulizer be set?

Setting the air entrainment port to 1.00 ensures that the nebulizer delivers an appropriate fraction of inspired oxygen (FiO2) of 50%. The air entrainment port is a critical component that allows ambient air to mix with the oxygen delivered through the nebulizer.

When the port is set correctly, it controls the ratio of oxygen to air, thus achieving the desired concentration of oxygen for the child. An entrainment ratio of 1.00 indicates a 1:1 mixing of air to oxygen, providing the right balance to obtain the 50% oxygen target.

In the context of oxygen therapy, it's important to ensure that the FiO2 aligns with the clinical needs of the patient, and setting the port at this level accurately yields the desired oxygen concentration.

Other options involve flow increases, settings that exceed the target FiO2, or gas analysis methods, which don't directly address the necessary adjustment for achieving 50% oxygen therapy through the nebulizer accurately.