Final answer:
The correct action for a nurse when a patient's T-tube is draining dark green fluid after gallbladder surgery is to document the color and amount of drainage, and notify the surgeon if there are accompanying concerning symptoms.
Step-by-step explanation:
If a patient's T-tube is draining dark green fluid after gallbladder surgery, the most appropriate action by the nurse would be to document the color and amount of drainage. It is typical for a T-tube to drain bile, which can range in color from green to brown. However, if the drainage is excessive, has a foul odor, or the patient experiences other concerning symptoms such as fever or abdominal pain, then the nurse should notify the surgeon. Immediate irrigation of the T-tube without surgeon's order is not standard practice, as it may introduce infection or disrupt the healing process. Bed rest is not directly related to the function of the T-tube.