Interpreting Thyroid function tests

Low TSH Raised T4 Levels

Thyrotoxicosis due to

Graves idsease

Thyroiditis

Toxic MNG

Normal TSH levels Raised T4 levels

Assay interference

Pituitary adenoma

 

 

Raised TSH Levels and Raised T4 levels

TSH hormone resistance

TSH producing pituitary adenoma

 

 

Low TSH Normal T4 levels

  1. Autonomous nodule
  2. Transient thyroiditis

 

Normal Thyroid functions

 

 

Raised TSH Normal T4 Levels

  1. Inadequate replacement
  2. Poor Concordance
  3. Autoimmune thyroiditis

 

Low TSH Low T4 levels

  1. Pituitary failure
  2. Sick Euthyroid syndrome

 

Normal TSH Low T4 levels

  1. normal
  2. hypopituitarism

 

Raised TSH  Low T4 Levels

  1. Inadequate replacement
  2. Primary hypothyroidism