What is the normal percentage range for ETCO2?

The normal percentage range for ETCO2 (end-tidal carbon dioxide) is typically considered to be between 35% and 45%. However, if looking specifically at common ranges encountered in practice, the values can be interpreted differently, especially in the context of monitoring and clinical assessments. Option D, which suggests a range of 4-6%, is often regarded as the standard in specific conditions or scenarios, where you might be monitoring with equipment that measures in percentage.

ETCO2 provides critical information about a patient's ventilation status, indicating how effectively carbon dioxide is being eliminated from the body. Values higher than normal can suggest hypoventilation or a rise in metabolic production of carbon dioxide, whereas lower values may indicate hyperventilation or inadequate perfusion.

In summary, understanding the normal range for ETCO2 is essential for assessing respiratory function and guiding patient care, particularly in critical situations.