Serum apolipoprotein A is an important component of HDL and the measured value of serum apolipoprotein A can reflect the amount of HDL in the blood. Normally, the normal value of serum ApoA is between 0.94-2.63 g/L in women and 0.8-2.3 g/L in men. If the measured value of serum ApoA exceeds the normal value, it may be caused by hyperlipidemia, or it may be caused by alcoholic hepatitis. If the measured value of serum ApoA is lower than normal, it may be caused by liver cirrhosis, acute hepatitis, malnutrition, diabetes, coronary heart disease, arteriosclerosis, etc. Once the test result is abnormal, timely treatment with drugs under the guidance of a doctor can help the body recover as soon as possible. Measurement of serum ApoA is best done in the morning on an empty stomach for more accurate measurement results.