What is the target for FiO2 to maintain adequate oxygen levels?

The target for FiO2 to maintain adequate oxygen levels is best reflected by the requirement of a PaO2 greater than 60 mmHg and an SpO2 greater than 90%.

Maintaining a PaO2 above 60 mmHg is crucial because this threshold is generally accepted as the minimum necessary to ensure adequate tissue oxygenation. Values lower than this can result in hypoxemia, which may lead to cellular dysfunction and ultimately organ failure. Similarly, an SpO2 above 90% indicates that a sufficient portion of hemoglobin is saturated with oxygen, ensuring that the body is receiving an adequate supply of oxygen for metabolic needs.

Both measures are important for assessing respiratory function: PaO2 provides a direct measurement of oxygen content in arterial blood, while SpO2 is a non-invasive method to estimate how well oxygen is being transported in the blood. Targeting these values helps healthcare providers balance the administration of supplemental oxygen while preventing potential complications associated with excessive oxygen levels, such as oxygen toxicity or respiratory acidosis. This makes option B the most appropriate choice for maintaining adequate oxygenation.