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 when administering 50% oxygen therapy is correct because it allows for optimal mixing of oxygen and entrained air to achieve the desired fraction of inspired oxygen (FiO2). In this scenario, the air entrainment port must be calibrated to deliver a precise oxygen concentration, ensuring that the mixing ratio of oxygen to air produces the target oxygen level of 50%.

The air entrainment port facilitates the controlled blending of atmospheric air with oxygen, and setting it to 1.00 indicates a specific ratio of inspired air to oxygen that is adequate for delivering 50% oxygen concentration. By achieving the appropriate balance between these gases, the desired clinical outcome can be attained without the risks of hypoxia or hyperoxia in the child.

Other options do not directly address the mechanism needed to achieve the specified FiO2 effectively; thus, they are not suitable choices for this scenario. This understanding of how to manipulate the air-oxygen mixing ratio is essential for delivering appropriate respiratory support in pediatrics.