A nurse is caring for a client who is postoperative and has a chest tube drainage system. For which of the following findings should the nurse notify the provider?

A. Presence of 50 mL/hr in the drainage chamber: Some drainage after chest tube placement is expected. A rate of 50 mL/hr is within a typical range for postoperative monitoring, especially in the first 24 hours, and does not usually require immediate provider notification unless it increases significantly or becomes bloody. B. Tidaling occurs when the client is breathing: Tidaling, or the rise and fall of fluid in the water seal chamber with respiration, indicates that the chest tube system is patent and functioning correctly. This is an expected finding and reflects normal intrathoracic pressure changes during breathing. C. Continuous bubbling in the water seal chamber: Continuous bubbling in the water seal chamber suggests an air leak in the system. This is abnormal and requires provider notification because persistent air leaks can impair lung re-expansion, compromise respiratory function, and may indicate malfunction of the system or a worsening pneumothorax. D. Oxygen saturation of 92% on room air: An oxygen saturation of 92% is slightly below normal but may be expected immediately postoperative or in clients with lung compromise. It requires monitoring and supplemental oxygen if needed, but it is not as urgent as a continuous air leak in the chest tube system.