A nurse is preparing to administer heparin subcutaneously to a client who has a deep vein thrombosis. Which of the following techniques should the nurse use?

The correct technique is C because it follows the standard practice for administering subcutaneous injections. Cleansing the skin with an alcohol swab helps prevent infection. Inserting the needle before injecting the heparin ensures proper placement. Injecting the heparin before observing for bleeding reduces the risk of leakage. This order minimizes the chances of complications. Option A is incorrect as aspirating is unnecessary for subcutaneous injections. Option B is incorrect as aspirating before injecting can lead to unnecessary pain. Option D is incorrect as massaging the site can cause bruising or discomfort. Overall, option C is the most appropriate and safe technique for administering heparin subcutaneously to a client with deep vein thrombosis.