Myoglobin is an iron-containing protein found mainly in the muscle cells of vertebrates, particularly in the heart and skeletal muscles. The main function of Myoglobin is to store oxygen and make it available to muscles when energy demands are high. This is especially important during strenuous exercise or prolonged periods of limited oxygen availability, such as deep diving in marine mammals like whales and seals. In terms of structure, myoglobin resembles a single subunit of haemoglobin. However, myoglobin is a monomer, whereas haemoglobin is made up of four subunits. Myoglobin also binds oxygen more strongly than haemoglobin, allowing it to take up oxygen from haemoglobin and supply it to muscle tissues when needed.
Clinical Significance of Myoglobin and Interpretation
Its clinical importance is associated with its use in identifying and monitoring various medical conditions, such as:
- Early Detection of Myocardial Infarction: Myoglobin rises faster and appears in serum within 2-4 hours of a heart attack.
- It is used to identify skeletal muscle destruction, which is termed Rhabdomyolysis.
- It is used to monitor muscle injury from accidents, surgery or muscular diseases.
- Myoglobin is also detectable in the urine as a result of hereditary myopathies.
Different Diagnostic ways to test for myoglobin levels
A doctor recommends a myoglobin test to measure myoglobin levels in serum or plasma.
The normal range for myoglobin levels is <115 ng/mL in healthy people. Commonly used methods to detect myoglobin levels in laboratories include fluorescence, chemiluminescence immunoassay (CLIA), peroxidase method, creatine kinase test, colloidal gold method, and immunoturbidimetric method.
The chemiluminescence immunoassay are used to quantitatively measure myoglobin in human serum or plasma as an aid in the diagnosis of myocardial infarction.
Conclusion Myoglobin provides oxygen to muscles, allowing them to maintain high activity for extended periods. When muscle damage occurs, myoglobin from muscle cells is released into the bloodstream, where it is cleared by the kidneys in urine. The myoglobin test is an important diagnostic tool for measuring myoglobin levels in the blood. It is used to identify myocardial infarction and heart muscle injuries, and to help doctors monitor the heart muscle.
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