In pneumonia, which SpO2 value indicates hypoxemia?

• A. 98%
• B. 97%
• C. 95%
• D. 93%

Answer: (D)

SpO2 shows how much oxygen is bound to hemoglobin in arterial blood, and it normally sits around 95–100%. Hypoxemia means there isn’t enough oxygen in the blood, which in practical terms shows up as an SpO2 that falls below the normal range. In pneumonia, inflammation and fluid in the lungs impair gas exchange, so SpO2 can drop as oxygen transfer becomes less efficient. A reading of 93% is the first value among the options that falls below the typical normal range, signaling hypoxemia and the need for further assessment and possible oxygen support. Values like 95% and higher are generally considered adequate oxygenation, while 93% is the lower, concerning value here. If there’s any doubt or if the reading is close to this threshold, confirm with a repeat measurement and consider arterial blood gas testing and clinical signs to guide treatment. Also ensure the measurement is accurate (proper probe placement, perfusion, and not affected by artifacts) to avoid misleading readings.