Healthy TSH Results for Adults

• According to WebMD, normal lab results for adults are between 0.4 and 4.5 mIU/L, or between 0.4 and 4.5 mU/L (SI units).
  
  

Healthy TSH Results for Babies

• Healthy TSH results for babies are different than adults. They should range from 3 to 18 mIU/L or 3 to 18 mU/L (SI units).
  
  

Measuring Other Thyroid Levels

• Many doctors also recommend testing the amounts of T3, T4 and TSH in the body to get a more accurate picture of the body's thyroid levels.
  
  

Other Tests to Request

• Hashimoto's disease, an autoimmune disorder of the thyroid, can produce antibodies against that organ but not affect TSH levels in the body. A separate test for autoimmune antibodies can be performed to rule out Hashimoto's.
  
  

How TSH Is Tested

• TSH levels can be tested by a simple blood draw at a local lab.