Medical HGB refers to hemoglobin, which is one of the important components of blood red blood cells and its main role is to transport oxygen and carbon dioxide to red blood cells. The value of normal HGB is based on how much hemoglobin is contained in each liter of blood, with a reference range of 120-165 g/L for men; 110-150 g/L for women; 120-140 g/L for children; and 180-190 g/L for newborns. there are many factors that affect the amount of HGB in a person’s body, such as heavy smoking can cause an increase in HGB, long-term Strenuous activity or the use of certain drugs can lower HGB. In addition, disease factors can also cause abnormal HGB in the body, and blood tests can assist in clinical diagnosis. 1. increased HGB: seen in hyperlipidemia, plateau disease, pulmonary heart disease, congenital heart disease, severe lung disease, etc. 2. decreased HGB: seen in diarrhea, massive burns, shock, iron deficiency anemia, thalassemia, aplastic anemia, liver disease, kidney disease, etc. It should be noted that hemoglobin is only a single indicator and cannot be used as a basis for diagnosis alone. It needs to be combined with the patient’s clinical manifestations, blood routine and other relevant examinations for diagnosis.