A nurse is obtaining a blood specimen from a client who has a peripherally inserted central catheter. Which of the following actions should the nurse take?

Use a 3 mL syringe to flush the catheter.

Cleanse the port with povidone-iodine prior to obtaining the specimen.

Flush with 20 mL of 0.9% sodium chloride after obtaining the blood sample.

Instruct the client to perform the Valsalva maneuver during the blood draw.