If a patient has low oxygen levels despite proper blood circulation, the most likely malfunctioning organ is the lungs. The lungs are responsible for oxygenating the blood by exchanging carbon dioxide for oxygen during the breathing process. Therefore, if oxygen levels are low, it indicates that the lungs are not effectively carrying out this vital function. Possible causes for this could include respiratory diseases or conditions such as pulmonary edema (fluid accumulation in the lungs), chronic obstructive pulmonary disease (COPD), or acute respiratory distress syndrome (ARDS). It is important for the patient to receive medical attention to diagnose and address the underlying cause of low oxygen levels.
