The single most important tool in determining a patient’s thyroid status is a thorough review of the symptoms of hypothyroidism presented. Secondly, the basal body temperature (BBT) must be accurately measured. The BBT is the core body temperature prior to arising from a full night’s sleep. The BBT reflects the body’s metabolic rate and energy production. Remember that energy in our bodies is converted to heat, giving our body a temperature. If our energy production is low, then the temperature of our body will be lower that normal. A normal BBT is between 97.8 and 98.2 degrees. The BBT may be taken in the following manner: Upon retiring, a glass thermometer should be shaken down so that the mercury is below 94 degrees, and placed on the bedside table. When the patient awakens, the thermometer should be placed against the skin under the arm for ten (10) minutes. After this time, record the temperature. Finally, blood test should be evaluated for the presence of thyroid antibodies, the level of the unbound thyroid hormone (Free T4), and the level of the thyroid stimulating hormone (TSH). The blood should be also evaluated to determine if there is elevation of cholesterol and low density lipoprotein (LDL).