What vital sign would be an early indication of hypoxia in a patient?

Low oxygen saturation is a critical vital sign indicating hypoxia because it directly measures the amount of oxygen bound to hemoglobin in the blood. When the oxygen saturation level falls below normal ranges (typically under 95% for healthy individuals), it signifies that the body is not receiving adequate oxygen, which is a primary indicator of hypoxia.

Early detection of hypoxia is vital because it allows for timely interventions, such as administering supplemental oxygen or addressing any underlying causes of the hypoxia. Monitoring oxygen saturation levels through pulse oximetry provides a non-invasive, quick assessment of respiratory function, which is essential in emergency situations.

Increased respiratory rate and increased heart rate can also be signs of the body trying to compensate for low oxygen levels. However, these responses may not specifically indicate hypoxia until other vital signs are assessed. Low blood pressure is typically more associated with shock or significant fluid loss rather than directly indicating hypoxia, making it less relevant in this particular context.