What measurement indicates severe hypoxia in a patient?

A pulse oximetry reading of 90% or lower is indicative of severe hypoxia. This value reflects that there is insufficient oxygen being transported in the bloodstream to meet the body’s needs. Normal oxygen saturation levels typically range from 95% to 100%. When the saturation falls below 90%, it suggests that the tissues may not be receiving adequate oxygen, leading to potential organ dysfunction and other serious complications.

Recognizing the significance of pulse oximetry readings is vital in emergency medical services, as it allows for prompt identification and intervention for conditions causing low oxygen levels. It also serves as a critical monitoring tool to assess the effectiveness of interventions such as supplemental oxygen or intubation. Lower readings signal the need for immediate action to address the hypoxia, whether through airway management, supplemental oxygen, or other critical interventions.

In contrast, higher readings indicate that the patient is maintaining adequate oxygen levels, while a respiratory rate below 12 breaths per minute suggests potential respiratory depression but does not specifically measure oxygen saturation. Visible cyanosis, while a concerning sign, is often a late manifestation of hypoxia and does not provide a direct measurement like a pulse oximetry reading does. Therefore, a reading below 90% provides a clear, quant