A screening pulse oximetry reading below what level requires an ABG analysis?

A screening pulse oximetry reading below 92% indicates that a patient's oxygen saturation levels may not be adequate for proper respiratory function and could signify a critical health issue. At this level, the lungs may not be effectively transferring oxygen into the bloodstream, which can lead to hypoxemia.

When the pulse oximeter reading falls below 92%, it is necessary to further assess the patient's oxygen levels and respiratory status. An arterial blood gas (ABG) analysis is then performed to provide a more accurate measurement of oxygen and carbon dioxide levels in the blood, along with the blood's pH. This is crucial for determining the appropriate clinical actions to take, such as the need for supplemental oxygen or other interventions.

Higher pulse oximetry readings, such as those over 92%, generally indicate adequate oxygen saturation, so an ABG analysis may not be necessary at those levels. Therefore, a reading below 92% is the threshold that triggers the need for more thorough evaluation through an ABG analysis.