A total cholesterol level of 138 mg/dL is generally considered excellent and falls well within the desirable range. Maintaining healthy cholesterol levels is important for cardiovascular health, as high cholesterol can lead to plaque buildup in arteries, increasing the risk of heart disease and stroke. Consult with your doctor to assess your overall risk factors and determine the best course of action for maintaining optimal heart health through diet, exercise, and, if necessary, medication.