As a subject matter expert in respiratory therapy, I can provide you with an accurate answer to your question regarding the percentage of oxygen in 4 liters. When we talk about oxygen concentration in the context of medical oxygen therapy, it's important to understand that the percentage of oxygen in room air is approximately 21%. When a patient is given supplemental oxygen at a flow rate of 4 liters per minute (L/min), the concentration of oxygen they are breathing is higher than room air. The increase in oxygen percentage with each liter of oxygen flow is not a fixed value and can vary depending on the patient's ventilation and the efficiency of the oxygen delivery device. However, a common approximation is that each liter of oxygen flow can increase the oxygen concentration by about 3 to 4 percent. Using this approximation, if a patient is receiving 4 liters of oxygen per minute, the oxygen concentration they are breathing would be roughly: 21% (room air) + (4 liters * 3-4% increase per liter) = approximately 33 to 37% O2. So, the answer to your question is that 4 liters of oxygen per minute would result in the patient breathing an oxygen concentration of about 33 to 37 percent. read more >>

Every liter/minute of oxygen increases the percentage of O2 the patient breathes by 3 �C 4 %. Room air is 21% O2. So if a patient is on 4 L/min O2 flow, then he or she is breathing air that is about 33 �C 37% O2.read more >>