Final answer:
The correct nursing action for obtaining a sterile urine specimen from an indwelling catheter is to aspirate urine from the tubing port using a sterile syringe while maintaining aseptic technique.
Step-by-step explanation:
When obtaining a sterile urine specimen from an indwelling catheter to prevent infection, the appropriate nursing action is D. Aspirate urine from the tubing port using a sterile syringe. This method minimizes the risk of introducing pathogens into the urinary system and ensures that the sample is uncontaminated by organisms that may be present in the drainage bag. It is critical to use aseptic technique throughout the process to maintain the sterility of the urine sample. This means using sterile gloves and cleansing the port with an antiseptic wipe before inserting the needle of the sterile syringe to collect the specimen. Once the sample is obtained, it's also important to transfer it to the sterile container without exposing it to the environment.