This test measures a protein called myoglobin in your urine. The test can help find out if your muscle tissue has been injured.
Myoglobin is found in your heart and skeletal muscles. There it captures oxygen that muscle cells use for energy. But when you have a heart attack or severe muscle damage, myoglobin is released from the muscle into your blood. Once there, it can rise to dangerous levels in your body.
Your kidneys filter your blood for myoglobin so that it can be removed from your body in your urine. But too much myoglobin can overwhelm the kidneys and lead to kidney failure. In some cases, this test can help your healthcare provider find the hazard and protect your kidney health.