Following placement of pulse oximetry and capnography, which value pair indicates normal readings?

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Multiple Choice

Following placement of pulse oximetry and capnography, which value pair indicates normal readings?

When pulse oximetry and capnography show normal readings, it means both oxygenation and ventilation are adequate. A pulse oximeter reading of 98% indicates the blood is well-saturated with oxygen. Capnography that is within normal limits reflects a stable end-tidal CO2 level—typically about 35–45 mmHg—with a clear, regular waveform—signaling effective ventilation and CO2 elimination. This combination confirms the airway is patent, ventilation is sufficient, and oxygen delivery is appropriate. In contrast, a capnography value that fluctuates can suggest variable ventilation, which isn’t as reassuring; capnography not measurable points to a potential disconnection or device issue; and a low SpO2 with a downward capnography trend indicates deteriorating ventilation or airway problems.

When pulse oximetry and capnography show normal readings, it means both oxygenation and ventilation are adequate. A pulse oximeter reading of 98% indicates the blood is well-saturated with oxygen. Capnography that is within normal limits reflects a stable end-tidal CO2 level—typically about 35–45 mmHg—with a clear, regular waveform—signaling effective ventilation and CO2 elimination. This combination confirms the airway is patent, ventilation is sufficient, and oxygen delivery is appropriate. In contrast, a capnography value that fluctuates can suggest variable ventilation, which isn’t as reassuring; capnography not measurable points to a potential disconnection or device issue; and a low SpO2 with a downward capnography trend indicates deteriorating ventilation or airway problems.

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