Western Governors University (WGU) NURS2508 D236 Pathophysiology Practice Exam

The most sensitive laboratory test for detecting rhabdomyolysis is creatine kinase (CK). Rhabdomyolysis is a condition characterized by the breakdown of muscle tissue, which leads to the release of muscle cell contents into the bloodstream. Among these contents, elevated levels of creatine kinase are a primary marker, as CK is an enzyme found in high concentrations in muscle tissue. When muscle cells are damaged, as occurs in rhabdomyolysis, CK can leak out into the bloodstream, and its levels can rise significantly, often to levels much higher than normal. While other tests like creatinine levels can provide information about kidney function and may indicate issues resulting from rhabdomyolysis, they do not have the same sensitivity for detecting muscle damage itself. A complete blood count (CBC) does not specifically indicate muscle injury and is more useful for evaluating overall health status and detecting infections or other hematological issues. Troponin levels are specific to cardiac muscle damage and are primarily used to diagnose heart-related conditions, such as myocardial infarction, rather than skeletal muscle injury. Therefore, creatine kinase is the appropriate laboratory test to confirm rhabdomyolysis due to its specificity and sensitivity in detecting muscle damage.