Which factor is NOT a limitation of Pulse Oximetry reliability?

Pulse oximetry is a non-invasive method used to measure the oxygen saturation of a patient's blood. Understanding its limitations is crucial for accurate interpretations of its readings.

Hypertension, or high blood pressure, is not a recognized factor that significantly affects the reliability of pulse oximetry readings. The technology primarily measures the ratio of oxygenated to deoxygenated hemoglobin in the blood, and while hypertension can have various effects on the cardiovascular system, it does not directly interfere with the ability of the pulse oximeter to accurately assess blood oxygen levels.

On the other hand, conditions such as hypoperfusion (poor blood flow), fingernail polish (especially darker colors), and sickle cell disease/anemia can all create situations where the pulse oximeter may struggle to provide accurate readings. Hypoperfusion can lead to diminished blood flow to the extremities, which can compromise the device's ability to detect a sufficient signal. Fingernail polish can obstruct the light waves used to assess oxygen saturation, especially if the polish is dark. Sickle cell disease and anemia can alter the content and composition of hemoglobin, potentially leading to inaccurate readings.

In summary, hypertension does not compromise the method of reading oxygen saturation, making it the correct choice as it