Low Apo B means that the patient’s Apo B is below the lower limit of normal. The normal range of ApoB is 0.43-1.28 g/L for men and 0.42-1.12 g/L for women. If ApoB is below 0.43 grams per liter in men and 0.42 grams per liter in women, the patient is considered to have low ApoB. Low ApoB may be caused by abnormal liver function or hypothyroidism, etc. In addition, frequent use of statin lipid-lowering drugs may also lead to low ApoB. When low Apo B is found, patients can check the thyroid function and liver function under the guidance of the doctor. If the liver function and thyroid function are normal, no special treatment is needed.