Final answer:
An SpO2 level at or below 88% combined with signs of hypoxemia, such as fatigue, headaches, and confusion, indicates the need to halt a test. Percent saturation measured by a pulse oximeter assesses the adequacy of blood oxygenation and assists in clinical decision-making.
Step-by-step explanation:
An SpO2 ≤ 88% with signs or symptoms of hypoxemia is an indication to stop a test. A pulse oximeter is utilized to measure the percent saturation of oxygen in the blood, which is also known as 'percent sat.' Normal readings are typically between 95-100 percent. Lower readings suggest hypoxemia, characterized by low blood oxygen levels—an issue that's particularly concerning for patients with symptoms such as fatigue, headaches, and confusion, indicative of hypoxia.
Understanding oxygen levels is vital, as sustained low levels can result in tissue hypoxia and potential injury, particularly to sensitive neurons. Clinical decisions regarding the adequacy of oxygenation rely heavily on percent saturation values obtained through non-invasive methods like pulse oximetry or invasive methods such as arterial blood gas tests measuring pO2.