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Protein electrophoresis and immunofixation electrophoresis measure abnormal proteins, or the absence of normal proteins in blood, urine or CSF.

Myoglobin is a small, oxygen-binding protein found in heart and skeletal muscles. When heart or skeletal muscle is injured, myoglobin is released into the blood and eliminated from the body in the urine. A myoglobin blood test may be used to detect muscle damage and a myoglobin urine test may reflect muscle damage and risk of kidney damage.