Which location is used for measuring pre-ductal saturation?

The correct response is based on the standard practice of measuring pre-ductal oxygen saturation, which refers to the oxygen saturation measured in the blood before it passes through the ductus arteriosus. The typical and recommended site for pre-ductal saturation assessment is the right hand. This site is used because it reflects the oxygen status before the blood returns from the upper body tissues, providing an accurate representation of the oxygenation prior to mixing with deoxygenated blood that occurs through the ductus arteriosus in newborns.

Using the right hand allows healthcare providers to gather critical information for diagnosing and managing conditions like congenital heart disease, where blood circulation pathways may be altered. Measurement at other sites, such as the left hand or either foot, would provide a different representation of the saturation that does not reflect the pre-ductal state. Thus, measuring from the right hand is essential for ensuring accurate assessments in these clinical scenarios.