Because of the wide tissue distribution, AST levels are not useful in the diagnosis of:

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Multiple Choice

Because of the wide tissue distribution, AST levels are not useful in the diagnosis of:

AST appears in many tissues—heart, liver, skeletal muscle, kidney, brain—so an elevated level signals that some tissue is damaged but does not reveal which one. Because of this broad distribution, AST cannot reliably diagnose a specific condition like myocardial infarction, hepatocellular disease, or skeletal muscle disease on its own. In clinical practice, cardiac injury is best identified with troponins, liver injury with more liver-specific enzymes such as ALT, and muscle injury with markers like CK. Therefore, AST elevations are not useful for distinguishing among these conditions, making all of the listed options applicable.

AST appears in many tissues—heart, liver, skeletal muscle, kidney, brain—so an elevated level signals that some tissue is damaged but does not reveal which one. Because of this broad distribution, AST cannot reliably diagnose a specific condition like myocardial infarction, hepatocellular disease, or skeletal muscle disease on its own. In clinical practice, cardiac injury is best identified with troponins, liver injury with more liver-specific enzymes such as ALT, and muscle injury with markers like CK. Therefore, AST elevations are not useful for distinguishing among these conditions, making all of the listed options applicable.

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