A nurse is caring for a client who is receiving total parenteral nutrition via a peripherally inserted central catheter (PICC). When assessing the client, the nurse notes swelling of the client's arm above the PICC insertion site. Which of the following actions should the nurse take first?

The correct answer is B: Measure the circumference of both upper arms. This is the first action the nurse should take as it helps assess for signs of swelling or edema that may indicate complications related to the PICC line, such as infiltration or infection. By comparing both arms, the nurse can determine if the swelling is localized to the arm with the PICC line, which is crucial for monitoring the client's condition.

The other choices are incorrect:
A: Removing the PICC line should not be the first action as it may cause further complications.
C: Notifying the provider should be done after assessing the client's condition to provide accurate information.
D: Applying a cold pack may not address the underlying issue and could potentially worsen the swelling.
Overall, measuring the arm circumference is the initial step in assessing the situation and determining the appropriate course of action.