Testing Yourself for Underactive Thyroid

• 1
  Keeping a Thyroid Diary
  
  Be prepared to perform these steps for three days straight. Before going to bed, place a thermometer, pen or pencil and a pad of paper or small notebook beside your bed. You will be using these items to create a thyroid diary.
  
  
• 2). First thing in the morning, before your feet even touch the floor, take your morning temperature by tucking the thermometer in your armpit and holding it there for at least 15 minutes. Relax and keep as still as possible.
  
  
• 3
  Taking Your Temperature
  
  After 15 minutes, remove the thermometer and read your temperature. Record your findings in your thyroid diary. Follow these steps exactly for three days in a row.
  
  
• 4). At the end of three days, determine your average reading by adding up all three daily readings and divide them by three.
  
  
• 5). If your average reading is below 97.5 degrees Fahrenheit, then it is very likely that you are experiencing the early stages of hypothyroidism, and should speak to your doctor about your findings.