Final answer:
The normal value of PaCO₂-ETCO₂=End-tidal gradient is typically around 2-5 mm Hg. This gradient represents the difference between the partial pressure of carbon dioxide (PaCO₂) in the arterial blood and the end-tidal carbon dioxide concentration (ETCO₂) measured during exhaled breath.
Step-by-step explanation:
The normal value of PaCO₂-ETCO₂=End-tidal gradient is typically around 2-5 mm Hg. This gradient represents the difference between the partial pressure of carbon dioxide (PaCO₂) in the arterial blood and the end-tidal carbon dioxide concentration (ETCO₂) measured during exhaled breath.
In a healthy individual, the PaCO₂-ETCO₂ gradient is relatively small. However, certain conditions such as lung disease or changes in ventilation-perfusion (V/Q) matching can cause an increased gradient.
It's important to note that the normal value may vary slightly depending on factors such as age and activity level.