What should you know about color of urine in rhabdomyolysis?

Color alone cannot confirm or rule out the condition. Rhabdomyolysis requires prompt medical testing because substances released from injured muscle can harm the kidneys and disrupt body salts.

Damaged muscle releases myoglobin into the bloodstream. The kidneys filter it, and enough myoglobin in urine can create a tea-like, red-brown, or cola shade. Rhabdomyolysis commonly presents with muscle pain, swelling, tenderness, or weakness, although the combination varies.

Dark urine has other possible causes, including dehydration, blood, liver or urinary problems, foods, and medicines. That is why clinicians use the history, examination, blood tests such as creatine kinase and kidney function, and urine testing rather than relying on appearance.

Stop strenuous activity and seek urgent medical assessment if dark urine follows intense exercise, heat exposure, a crush injury, prolonged immobility, a seizure, or a new medicine and occurs with marked muscle symptoms. Do not exercise through it or wait for the urine to clear.

Tell the clinician when the change began, how much urine you are passing, what activity or injury preceded it, and every medicine, supplement, alcohol, or recreational drug involved. Do not force large amounts of fluid if you are vomiting, confused, passing very little urine, or have been told to restrict fluids.

Go to an emergency department now for dark urine with severe muscle pain or weakness, rapidly increasing swelling, very little or no urine, confusion, fainting, chest symptoms, breathing difficulty, persistent vomiting, or illness after major heat exposure or crush injury. Normal urine color should not delay care when these warning signs are present.

Ask which blood and urine results indicate muscle injury, whether kidney function and electrolytes need repeat checks, which medicines or activities should be paused, how to restart exercise safely, and what urine or muscle changes should bring you back immediately.