What should you know about a urine myoglobin test?

A urine myoglobin test checks for myoglobin released into urine when muscle tissue is damaged. Myoglobin normally stays inside muscle cells. If those cells are injured, the protein can enter the bloodstream and pass through the kidneys into urine.

A detected result can occur after severe exercise, a crush injury, a prolonged period of immobility, seizures, or another muscle problem. It does not identify the cause by itself. A clinician may compare it with your symptoms, blood tests, kidney function, and urine appearance. Dark urine, muscle pain, tenderness, or weakness can provide useful context.

The test is different from a routine urine test, which can assess blood, infection signs, concentration, and other substances. Kidney strain can develop when muscle breakdown releases large amounts of material, so the result may prompt timely review.

Give the sample exactly as instructed and tell the clinician about recent strenuous activity, injuries, falls, new medicines, supplements, or time spent unable to move. Do not start or stop a medicine based only on this result. Drink fluids as advised, especially if a clinician is assessing possible muscle breakdown or kidney stress.

If urinary symptoms are also present, the clinician may consider other explanations such as a urinary infection or kidney infection. Learn more about a [Urine Test](/treatments/diagnostics-and-screening/urine-test/) and [Kidney Infection](/conditions/kidney-infection/).

Seek urgent medical care for very dark or cola-coloured urine, severe muscle pain or swelling, marked weakness, fainting, confusion, very little urine, or trouble breathing. These symptoms can accompany significant muscle injury or kidney complications and need prompt assessment.

Ask what prompted the test, whether the result is abnormal, which blood or urine checks are needed next, and whether activity, medicines, or hydration should change while you are being assessed.