Serum myoglobin is a test that measures the amount of myoglobin in the blood.
Myoglobin is a protein in heart and skeletal muscles. When you exercise, your muscles use up any available oxygen. Myoglobin has oxygen attached to it, which provides extra oxygen for the muscle to maintain a high level of activity for a longer period of time.
When muscle is damaged, myoglobin is released into the bloodstream. Ultimately, it is removed in the urine.
