A nurse is caring for a client who has an admitted diagnosis of renal calculi and medical history of hypertension and gout. The client works 6 days of the week outside in temperatures between 32.2° C to 37.8° C (90° F to 100° F). Which of the following should the nurse tell the client to prevent a reoccurrence of renal calculi?

A. Continue to take your prescribed gout medication.: Gout medications like allopurinol reduce serum uric acid levels, which prevents the formation of uric acid stones. While this is important for his history of gout, it does not address the environmental risk factors related to his job. Pharmacological management must be combined with lifestyle changes to effectively prevent recurrence in high-heat environments. B. Drink plenty of fluids during the day.: Working in extreme heat causes significant fluid loss through diaphoresis, leading to highly concentrated urine and the precipitation of stone-forming minerals. Increased hydration dilutes the urine and lowers the concentration of solutes like calcium and uric acid. This is the most critical preventative measure for a client working in high-temperature conditions. C. Eat a diet high in purine-rich foods.: Purines are metabolized into uric acid, and a high intake can lead to both gout flares and uric acid renal calculi. The nurse should instead instruct the client to consume a low-purine diet, avoiding organ meats and certain seafood. Increasing purine intake would directly contribute to the recurrence of stones in this patient. D. Eat a diet high in calcium oxalate-rich foods.: Most kidney stones are composed of calcium oxalate; therefore, a diet high in these substances increases the risk of stone formation. The client should be advised to limit foods like spinach, rhubarb, and nuts to reduce the oxalate load in the urine. Promoting high-oxalate foods is counterproductive to the goal of stone prevention.