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The Serum Myoglobin Test measures the level of myoglobin, a protein found in heart and skeletal muscles. It is released into the bloodstream when muscle damage occurs.
✅ Early Detection of Heart Attack (Myocardial Infarction) – Myoglobin is one of the first markers to rise after heart muscle damage.
✅ Assess Rhabdomyolysis (Severe Muscle Breakdown) – Seen in trauma, muscle disorders, or extreme exercise.
✅ Monitor Muscle Disorders – Such as muscular dystrophy or inflammatory muscle diseases.
✅ Check for Kidney Damage – High myoglobin levels can cause myoglobinuria, leading to acute kidney injury (AKI).
📌 Normal Myoglobin Levels:
(Reference ranges may vary slightly by laboratory.)
| Myoglobin Level (ng/mL) | Possible Interpretation | Potential Causes |
|---|---|---|
| Normal (<72 in men, <58 in women) | No significant muscle damage | Healthy muscle function |
| Slightly Elevated | Mild muscle injury | Exercise, minor trauma, muscle strain |
| Moderately Elevated (100–500 ng/mL) | Muscle damage or cardiac injury | Myocardial infarction, rhabdomyolysis, myositis |
| Highly Elevated (>500 ng/mL) | Severe muscle breakdown | Rhabdomyolysis, crush injury, severe heart attack |
📌 Myoglobin rises within 1-3 hours of a heart attack, peaks at ~6-12 hours, and returns to normal in 24 hours.
🔹 Cardiac Causes:
✔ Heart Attack (Myocardial Infarction) – Early marker but not heart-specific (troponin is preferred).
✔ Cardiac Surgery or Trauma – Can cause muscle injury.
🔹 Skeletal Muscle Causes:
✔ Rhabdomyolysis – Severe muscle breakdown (from trauma, drugs, extreme exercise).
✔ Muscle Diseases – Muscular dystrophy, myositis, polymyositis.
✔ Crush Injury or Burns – Can lead to high myoglobin release.
🔹 Other Causes:
✔ Severe Sepsis, Shock, or Multisystem Organ Failure
✔ Intense Exercise or Seizures – Can cause temporary myoglobin elevation.
🩺 If Elevated:
🔹 Perform Troponin Test – To confirm a heart attack.
🔹 Order Creatine Kinase (CK) Test – To assess muscle damage.
🔹 Check Kidney Function (Creatinine, BUN) – Myoglobin can damage the kidneys.
🔹 Hydration Therapy – If rhabdomyolysis is suspected, IV fluids may be needed.
⚠ Troponin is a more specific test for heart attacks, while myoglobin is more useful for general muscle injury.