What can capnometry assess noninvasively?

Capnometry is a noninvasive monitoring technique that measures the concentration of carbon dioxide (CO2) in exhaled air. This process provides valuable insights into a patient's ventilatory status, which refers to the effectiveness of the respiratory system in exchanging gases. By analyzing the levels of CO2, healthcare professionals can assess if a patient is adequately ventilating, which is crucial for ensuring that the body is properly removing carbon dioxide, a waste product of metabolism, and acquiring enough oxygen.

When evaluating ventilatory status through capnometry, changes in the amount of CO2 can indicate respiratory problems such as hypoventilation (inadequate ventilation) or hyperventilation (excessive ventilation). Consequently, capnometry serves as an essential tool in clinical settings for monitoring patients' respiratory health, particularly in emergency situations and during anesthesia.

The other choices do not align with the capabilities of capnometry. Cardiac output assesses heart function, while oxygenation levels reflect the amount of oxygen in the blood. Fluid balance relates to a patient’s fluid status, which is monitored through different means. Therefore, capnometry specifically provides critical information regarding ventilatory status, making it a vital aspect of respiratory assessment.