A nurse in the emergency department is caring for a client who reports chest pressure and shortness of breath. Which of the following laboratory tests should the nurse anticipate the provider to prescribe?

Choice A reason: BNP is used to assess heart failure, not acute coronary syndrome. While it may be ordered in some cases, it is not the primary test for chest pain and suspected myocardial infarction. Choice B reason: Lipase is used to evaluate pancreatitis and is unrelated to cardiac symptoms such as chest pressure or shortness of breath. Choice C reason: Troponin I is the most specific and sensitive biomarker for myocardial injury. It is the gold standard for diagnosing acute myocardial infarction. Choice D reason: AST is a liver enzyme that may be elevated in various conditions but is not specific to cardiac events. It is not routinely used to diagnose myocardial infarction.