Had an extremely intense training session or muscle injury and now noticing dark urine and severe soreness — concerned about rhabdomyolysis and want to check your myoglobin levels?
Measures myoglobin, a protein released from muscle cells when they are damaged. Used to investigate suspected rhabdomyolysis, severe muscle trauma, and as a supporting marker in cardiac investigations.
You will be emailed a referral to take to your local collection centre. If you ever have any questions, we're here to help.
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1
Order a test
Order the private test that suits you and your goals. After ordering, you will receive your referral by email.
2
Collect the sample
Attend one of our 4000+ partner collection centres throughout Australia. Search locations.
3
Receive your results
View all your lab results in your secure health dashboard. Easy!
Overview
Myoglobin is an oxygen-binding protein found inside skeletal and cardiac muscle cells. Under normal circumstances, very little myoglobin leaks into the bloodstream. When muscle cells are damaged, however, myoglobin is released rapidly, making it one of the earliest markers of muscle injury to appear in the blood.
The most common clinical use of myoglobin testing is in the investigation of rhabdomyolysis. This is a condition where severe muscle breakdown releases large amounts of cellular contents, including myoglobin, creatine kinase, and electrolytes, into the bloodstream. Causes of rhabdomyolysis include extreme or unaccustomed exercise, crush injuries, prolonged immobilisation, severe heat exposure, certain medications (particularly statins in rare cases), and some metabolic conditions. When myoglobin levels are very high, the protein can overwhelm the kidneys and contribute to acute kidney injury.
Myoglobin also has a historical role in cardiac assessment. Because the heart is a muscle, cardiac damage releases myoglobin into the blood within 1 to 3 hours. However, myoglobin is not specific to cardiac muscle, so it has largely been replaced by cardiac troponin for heart attack investigation. It may still be used as a supporting marker in some clinical settings.
One characteristic of myoglobin is its rapid clearance from the blood. Levels typically peak within 6 to 9 hours of muscle injury and can return to normal within 24 to 36 hours. This means that the timing of the blood draw relative to the injury event is important for an accurate result.
Symptoms
Myoglobin testing is most commonly used to investigate rhabdomyolysis, a condition where severe muscle breakdown releases large amounts of cellular contents into the bloodstream, which can affect the kidneys. Causes include extreme exercise, crush injuries, severe heat exposure, certain medications, and some metabolic conditions. It's also used in the context of acute muscle injuries and, in combination with other markers, in cardiac investigations.
Questions
Rhabdomyolysis is a condition where muscle cells break down rapidly and release their contents — including myoglobin, creatine kinase, and electrolytes — into the bloodstream. In severe cases, this can overwhelm the kidneys and cause acute kidney injury. Causes include extreme exercise, trauma, overheating, alcohol, certain medications, and inherited muscle disorders.
The heart is a muscle, and cardiac muscle damage releases myoglobin into the bloodstream. Myoglobin rises quickly after a heart attack — often within 1–3 hours — which made it historically useful as an early marker. However, it's not specific to cardiac muscle (it rises with any muscle damage), so more specific cardiac troponin tests are now preferred for diagnosing heart attacks.
Myoglobin has a short half-life in blood — it typically peaks within 6–9 hours after muscle injury and can clear within 24–36 hours. This means timing your test relative to the injury matters. Urine myoglobin persists longer and may give a useful window if the blood test is delayed.
Dark, tea-coloured, or cola-coloured urine after intense exercise can indicate myoglobinuria — myoglobin passing into the urine because blood levels are very high. This is a warning sign of rhabdomyolysis and should be assessed by a doctor promptly, not managed at home.
It can be, but creatine kinase is more commonly used for monitoring muscle damage in athletes because it remains elevated for longer and gives a better picture of cumulative muscle stress. Myoglobin's rapid clearance makes it less useful for routine monitoring.
In rhabdomyolysis investigation, myoglobin is typically measured alongside creatine kinase (the main muscle damage marker), kidney function tests (creatinine, eGFR), electrolytes (particularly potassium, which can become dangerously elevated), and urine for myoglobin and kidney damage markers.
Dr. Vu Tran Bloody Good’s Chief Medical Officer
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How to prepare
- No fasting required for this test
- This test is most useful when symptoms are present — myoglobin clears from the blood rapidly (within hours), so timing of the blood draw relative to the injury or exertion matters
- Let the collecting practitioner know the timeline and context (e.g., when the exercise or injury occurred)
- For the most useful result, have the test done as soon as possible after the suspected muscle injury event
After the test
If your myoglobin result is elevated and you have symptoms of rhabdomyolysis (muscle pain, weakness, dark urine), seek medical attention promptly. The kidneys are at risk when myoglobin levels are very high, and this can require urgent management including aggressive hydration.
Your test results will be available in your private dashboard. If there are any urgent issues, we'll let you know so you can follow up with your health professional.
Understanding results
Normal myoglobin levels are typically below 90 ng/mL, though reference ranges vary by laboratory. Elevated levels indicate significant muscle damage. Because myoglobin clears the blood quickly but lingers in urine, urine myoglobin testing is sometimes also used. Elevated myoglobin should be interpreted by a doctor in the context of your symptoms, creatine kinase levels, and kidney function.
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Frequently Asked Questions
Most collection centres accept walk-ins. Some may require a booking - check details when you click on your chosen location.
If your test needs fasting, we’ll include that in your instructions after you order. Fasting usually means no food for 8–12 hours, but water is fine.
Just your pathology referral form (we email it to you)
Of course. Just maybe don’t bring the friend who faints at the sight of blood.
They’re the highly trained professionals who take your blood sample - with a steady hand and a sharp needle. They love blood, but don’t worry… they’re not vampires. Just legends who make blood tests quick, clean, and (almost) painless.
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