A nurse is reviewing the laboratory findings of a client who experienced an acute myocardial infarction 6 days ago. Which of the following laboratory values should the nurse expect to remain elevated at this time?

A. Troponin T: Troponin remains elevated for many days (often up to 10–14 days), so it is expected to still be high at day 6. B. Creatinine phosphokinase: CK (total CPK) peaks early and typically returns toward normal within 48–72 hours, so it is unlikely to remain elevated at day 6. C. Myoglobin: Myoglobin rises very early and clears within 24 hours, so it would be normal by day 6. D. Creatinine kinase-MB: CK-MB rises and falls faster than troponin (usually normalizes by 3–4 days), so it is unlikely to remain elevated at day 6.