What does SpO2 represent?

SpO2 refers to the saturation of oxygen in the blood, specifically the percentage of hemoglobin molecules in the bloodstream that are bound with oxygen. Measuring SpO2 is crucial in assessing a patient's oxygenation status and determining whether they are receiving adequate oxygen for their physiological needs.

When a pulse oximeter is used, it provides a non-invasive way to estimate this saturation level. Normal SpO2 levels typically range between 95% and 100% for a healthy individual, indicating that the majority of hemoglobin is carrying oxygen. If the reading falls below this range, it may signal hypoxemia, which can lead to various health complications if not addressed.

The other options do not accurately describe what SpO2 measures. Standard pressure, spontaneous transfer, and systemic pressure of oxygen do not convey the specific meaning associated with SpO2, which is focused solely on the oxygen saturation level of hemoglobin. Understanding what SpO2 indicates helps healthcare providers in making informed decisions related to patient care, especially in cases of respiratory distress or underlying lung conditions.