A nurse is collecting data on a client who has manifestations of osteoporosis. The nurse anticipates the provider will prescribe which of the following diagnostic tests?

A. CT scans provide detailed imaging but are not the standard for diagnosing osteoporosis. B. Long bone x-rays can show fractures but are not sensitive enough to detect early bone density loss. C. Dual-energy x-ray absorptiometry (DEXA) is the preferred and most accurate test for measuring bone mineral density and diagnosing osteoporosis. D. Serum calcium levels do not reliably indicate bone density or osteoporosis, as calcium can be normal even with significant bone loss.