A nurse is preparing to administer heparin subcutaneously to a client. Which of the following is an appropriate action by the nurse?

The correct answer is B: Inject the medication into the abdomen above the level of the iliac crest. This is appropriate for subcutaneous heparin administration as the abdomen provides a larger and more consistent area for absorption. This location also reduces the risk of hitting underlying muscles or blood vessels. Using a 22-gauge needle (Option A) may be too large and cause unnecessary discomfort. Massaging the injection site (Option C) is contraindicated as it can lead to hematoma formation. Using a 1-inch needle (Option D) may not be suitable for all clients, as the length of the needle should be based on the individual's body habitus.