It does not matter if myoglobin is <10μg/L, it does not have much clinical significance, it only means that there is less myoglobin in the blood, which is due to myocardial metabolism and is usually not a big problem. The normal value of myoglobin, usually should be <100μg/L. Myoglobin is a small molecule pigment protein that binds reversibly with oxygen to form oxygenated myoglobin, which has the role of oxygen transport and storage in myocytes. Myoglobin is present only in cardiac muscle and skeletal muscle. In case of myocardial damage myoglobin diffuses out of cardiac muscle cells and enters the blood circulation. Myocardial infarction will show an increase in myoglobin because myoglobin appears early, about 2 hours in the blood, so if myoglobin is still normal after 2 hours in a patient with chest pain, heart disease can basically be ruled out. If the myoglobin exceeds the upper limit of normal by a factor of 2 at this time, the patient should be alerted to the possibility of heart-related injury and should be observed. In addition, specific enzymes related to myocardial injury, such as creatine kinase, creatine kinase isoenzyme, and troponin, can be checked to jointly assess whether the disease is of the heart site. People who live with excessive exercise or exercise more can also have elevated myoglobin, so the changes in myoglobin should be judged comprehensively. Myoglobin <10 μg/L is not of great clinical significance, and patients need not be particularly alarmed, and attention to regular rechecking is sufficient.