Which laboratory value is an indicator of cell injury or damage?

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Multiple Choice

Which laboratory value is an indicator of cell injury or damage?

Cell injury causes intracellular components to leak into the bloodstream. Aspartate aminotransferase is an enzyme found in many tissues—liver, heart, muscle, kidney, and brain—so when those cells are damaged, AST spills into the blood. That makes elevated AST a general signal of cellular injury or damage across tissues, not limited to one organ. In contrast, bilirubin is a pigment tied to breakdown and processing of hemoglobin and bile-excretion pathways, so it reflects issues with bilirubin metabolism rather than direct cell damage. Serum albumin reflects liver synthetic function and nutritional status, not acute injury. Alanine aminotransferase is more specific to hepatocytes, so it points to liver cell injury rather than general cell damage.

Cell injury causes intracellular components to leak into the bloodstream. Aspartate aminotransferase is an enzyme found in many tissues—liver, heart, muscle, kidney, and brain—so when those cells are damaged, AST spills into the blood. That makes elevated AST a general signal of cellular injury or damage across tissues, not limited to one organ. In contrast, bilirubin is a pigment tied to breakdown and processing of hemoglobin and bile-excretion pathways, so it reflects issues with bilirubin metabolism rather than direct cell damage. Serum albumin reflects liver synthetic function and nutritional status, not acute injury. Alanine aminotransferase is more specific to hepatocytes, so it points to liver cell injury rather than general cell damage.

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