Which condition would the nurse suspect in the male client whose laboratory report shows creatine kinase levels higher than the normal range?

A. Femur fracture is incorrect because creatine kinase (CK) is an enzyme found primarily in skeletal muscle, cardiac muscle, and brain tissue, not bone. Although a traumatic fracture can cause some surrounding muscle injury, isolated bone fractures do not typically result in significantly or persistently elevated CK levels. CK elevation reflects muscle cell damage, not bone injury. B. Muscular dystrophy is correct because it is a genetic neuromuscular disorder characterized by progressive muscle fiber breakdown and weakness. As muscle cells degenerate, CK is released into the bloodstream, often resulting in markedly elevated levels, sometimes even before obvious muscle weakness is present. In male clients, this is especially significant because certain types, such as Duchenne muscular dystrophy, are X-linked and commonly present in males with very high CK levels early in the disease course. C. Osteoporosis is incorrect because osteoporosis involves loss of bone mineral density, increasing fracture risk, but it does not involve muscle cell destruction. Therefore, CK levels are typically normal in patients with osteoporosis unless another muscle-related condition is present. D. Scoliosis is incorrect because scoliosis is a spinal curvature disorder affecting the alignment of the vertebrae. While it may be associated with muscle imbalance or discomfort, it does not cause muscle fiber breakdown or elevated CK levels.