Advanced Emergency Medical Technician (AEMT) Practice Test

Which gas is primarily measured in capnometry?

1. Oxygen

2. Carbon Dioxide

3. Nitrogen

4. Carbon Monoxide

The correct answer is: Carbon Dioxide

Capnometry primarily measures the concentration of carbon dioxide (CO2) in the respiratory gases during exhalation. This process involves utilizing a device called a capnometer, which provides real-time feedback on the levels of CO2, offering crucial insights into a patient's ventilation status. Monitoring carbon dioxide is vital in various clinical scenarios, including assessing the adequacy of ventilation, managing patients in respiratory distress, and evaluating the effectiveness of CPR. An increase or decrease in the measured CO2 can indicate underlying issues such as hypoventilation or hyperventilation, informing immediate treatment decisions. Evaluating other gases, like oxygen, nitrogen, or carbon monoxide, does not fall under the primary function of capnometry. Oxygen might be monitored through pulse oximetry, while nitrogen is not typically a target in emergency scenarios, and carbon monoxide requires different specific measurement techniques. Understanding the role of carbon dioxide in the respiratory cycle is essential for healthcare providers, emphasizing the significance of capnometry in advanced emergency medical practice.