Oxygen should be given if SpO2 falls below what percent?

Oxygen should be given if SpO2 falls below what percent?

• A. 96%
• B. 92%
• C. 94%
• D. 98%

Answer: (C)

Oxygen therapy is started when SpO2 falls below the level at which tissues may start to become hypoxic. In most adults, normal SpO2 is about 95–100%, and the practical goal in the field is to keep SpO2 at or above 94%. This threshold helps ensure adequate oxygen delivery to vital organs without overdoing oxygen, which can lead to unnecessary risks. A threshold of 94% is chosen because it reliably catches early hypoxemia and prompts timely treatment, whereas waiting until 96% or 98% would miss milder cases, and 92% would risk under-treatting some patients. There is an exception for certain patients, like those with COPD, where targets may be lower (often 88–92%) to avoid CO2 retention, but for the general adult population, 94% is the standard cue to administer oxygen.

Oxygen therapy is started when SpO2 falls below the level at which tissues may start to become hypoxic. In most adults, normal SpO2 is about 95–100%, and the practical goal in the field is to keep SpO2 at or above 94%. This threshold helps ensure adequate oxygen delivery to vital organs without overdoing oxygen, which can lead to unnecessary risks. A threshold of 94% is chosen because it reliably catches early hypoxemia and prompts timely treatment, whereas waiting until 96% or 98% would miss milder cases, and 92% would risk under-treatting some patients. There is an exception for certain patients, like those with COPD, where targets may be lower (often 88–92%) to avoid CO2 retention, but for the general adult population, 94% is the standard cue to administer oxygen.