Low TSH with Normal T4 | Thyroid Function - MedSchool
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Thyroid Function
 
 
Thyroid Function
Reduced TSH with a normal T4 level is suggestive of subclinical hyperthyroidism, a condition which is often asymptomatic. There are several other causes that make up the differential diagnosis.
 

Low TSH with Normal T4

 
 

Overview

  • Reduced TSH with a normal T4 level is suggestive of subclinical hyperthyroidism, a condition which is often asymptomatic. There are several other causes that make up the differential diagnosis.
    • Causes of Reduced TSH with Normal T4

    • Subclinical hyperthyroidism
    • Recent treatment of hyperthyroidism
    • Intermittent thyroxine
    • T3 thyrotoxicosis
    • Nonthyroidal illness
    • Drugs - steroids, dopamine, dobutamine
    • Pearls

    • Ask about symptoms of hyperthyroidism.
    • If the patient is clinically thyrotoxic, consider T3 toxicosis and check the patient’s T3.
    • Take a careful medication history, including past treatment for hyper or hypothyroidism.
    • Ask about recent illnesses.
Last updated on July 29th, 2019
 
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