Thyroid Function

 

Thyroid

 

Thyroid disorders can be difficult to detect clinically, but thyroid function tests can assist in making a diagnosis.  Measuring thyroid stimulating hormone (TSH) is the first step.

 

If the TSH is abnormal, free thyroxine should be measured. A raised concentration of thyroid stimulating hormone with a low concentration of free thyroxine can suggest hypothyroidism.   

 

A low concentration of thyroid stimulating hormone with a high concentration of free thyroxine can suggest hyperthyroidism.

 

Measuring thyroid autoantibodies may help establish the cause of the dysfunction. Different assays can give different results, and tests of thyroid function may be affected by drugs and certain illnesses.

 

The early morning temperature (basal body temperature) is often used as a sub-clinical sign of hypothyroid disease.