What should you know about myoglobin in urine and rhabdomyolysis?

Myoglobin is a protein stored inside muscle cells. When muscle tissue is injured or breaks down, myoglobin can enter the bloodstream and pass into urine. Rhabdomyolysis is the medical term for substantial muscle breakdown. It may follow unusually intense exercise, crushing injury, prolonged immobility, heat illness, seizures, infection, or a medicine or substance effect.

Urine may look dark, tea-coloured, or brown, although colour alone cannot confirm the diagnosis. Blood tests can assess muscle injury and kidney function, while clinicians also consider the history, examination, urine findings, hydration, and possible trigger.

Contact a healthcare service promptly if rhabdomyolysis is suspected, especially after strenuous activity or an injury. Do not return to exercise to test the muscle. Rest, avoid alcohol and non-prescribed supplements, and tell the clinician about medicines, drugs, heat exposure, and recent exertion. Follow advice about fluids because the right plan depends on your condition and kidney function.

Treatment may involve observation, fluids given by mouth or through a vein, repeat blood tests, and management of the trigger. Severe cases may need hospital monitoring.

Go to urgent care for dark urine with marked muscle pain or weakness, very little urine, swelling of a limb, vomiting, confusion, fainting, breathing difficulty, or inability to move normally. Symptoms can worsen even when muscle soreness initially resembles ordinary muscle soreness after exercise.

Ask what may have triggered the muscle breakdown, which blood and urine tests are needed, how much activity is safe, and which medicines or supplements should be paused. Ask when kidney function and muscle markers should be checked again.