An adult with arthritis has been receiving treatment with naproxen and now reports ongoing stomach pain, increasing weakness, and fatigue. Which laboratory test should the nurse monitor?

Choice A: 18%. This is not the correct percentage, as it only accounts for one lower extremity. According to the rule of nines, each lower extremity accounts for 9% of body surface area on both anterior and posterior sides, so both lower extremities would account for 18% x 2 = 36%.

Choice B: 27%. This is not the correct percentage, as it only accounts for one and a half lower extremities. According to the rule of nines, each lower extremity accounts for 9% of body surface area on both anterior and posterior sides, so one and a half lower extremities would account for 9% x 3 = 27%.

Choice C: 36%. This is the correct percentage, as it accounts for both lower extremities. According to the rule of nines, each lower extremity accounts for 9% of body surface area on both anterior and posterior sides, so both lower extremities would account for 9% x 4 = 36%.

Choice D: 45%. This is not the correct percentage, as it accounts for more than both lower extremities. According to the rule of nines, each lower extremity accounts for 9% of body surface area on both anterior and posterior sides, so more than both lower extremities would account for more than 9% x 4 = 36%.

Choice A: Ask for a consultation with a psychologist. This is not the best intervention, as it does not address the physical aspect of pain management. A psychologist may help the client cope with emotional distress and cognitive-behavioral strategies to reduce pain perception, but it may not be enough to relieve severe pain.

Choice B: Arrange an appointment with a pain specialist. This is the best intervention, as it addresses the physical aspect of pain management. A pain specialist may prescribe appropriate medications, perform interventional procedures, or recommend alternative therapies to relieve severe pain.

Choice C: Contact a hospice nurse for an evaluation. This is not the best intervention, as it does not address the eligibility criteria for hospice care. Hospice care is intended for clients who have a terminal illness with a life expectancy of six months or less, and who have decided to forego curative treatments. Fibromyalgia is not a terminal illness, and hospice care may not be appropriate for this client.

Choice D: Form an interdisciplinary team for evaluation. This is not the best intervention, as it does not address the urgency of pain management. An interdisciplinary team may consist of various healthcare professionals who can provide holistic care for the client, but it may take time to coordinate and implement their services.