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41. A client receiving oral theophylline is due to have a theophylline level drawn. The nurse should question the client to ensure that the client has not ingested which substance before theblood sample is drawn?1. Coffee2. Oatmeal3. Ginger ale4. Bagel with cream cheeseCorrect answer: 1Rationale: Theophylline is a xanthine bronchodilator. Before a serum level of the medication is drawn, the client should avoid taking foods or beverages that contain xanthine, such as colas, coffee, or chocolate; therefore, the client is told to avoid coffee before the test. The items in the other options do not need to be avoided before this test.42. A client taking rifampin reports, "My urine has blood in it." When the nurse assesses the urine, it is brown. Which is the nurse's bestaction?
43. A clinic nurse is assessing a client who has been on isoniazid for 6 months. Which client complaint should mostconcern the nurse?44. The client questions the nurse as to why the health care provider switched the usual prescription from a metered-dose inhaler (MDI) to a dry powder inhaler (DPI). The nurse should respond correctly by providing which facts? Select all that apply.