Serum or plasma concentration of myoglobin

Why is this test done?

Your doctor may order this test if you have symptoms like muscle pain, weakness, or cramping, especially after exercise, trauma, or certain medical conditions. It can also be used to monitor muscle damage in people with conditions like rhabdomyolysis (a serious muscle breakdown) or after procedures like surgery or chemotherapy.

What does a high or low result mean?

Elevated levels of myoglobin in the blood can signal muscle injury or breakdown. Very high levels may indicate severe muscle damage, which can lead to kidney problems if myoglobin builds up in the kidneys. Low levels are less commonly evaluated in this test, as they are typically not clinically significant in isolation.

How is this test performed?

A blood sample is taken from a vein in your arm. The blood is then processed to separate the serum or plasma, where myoglobin levels are measured using a specialized laboratory technique, often an immunoassay or enzymatic method.

What should you do before the test?

Avoid strenuous exercise or activities that cause muscle damage for 24 hours before the test. Inform your doctor about any medications you’re taking, especially those that affect muscle function or kidney health, such as certain pain relievers or antibiotics.