Tests for diagnosing Hyperthyroidism

Reading time: 1 min
Blood collection tube

Analytical tests. A diagnosis of hyperthyroidism is confirmed by tests that measure the level of active (free, not protein-bound) thyroid hormones –free thyroxine (T4L) and free triiodothyronine (T3L), and thyroid-stimulating hormone, thyrotropin (TSH) in the blood.  

A high level of thyroid hormones (T4L and T3L) with low levels of TSH indicates hyperthyroidism or thyrotoxicosis.  

In pituitary forms, high levels of T4L and T3L with high TSH are found.  

General biochemical parameters such as cholesterol, liver transaminases or blood glucose may show transient variations in the course of the disease due to the fact that the thyroid is the main controller of metabolism. In cases of hyperthyroidism, thyroid-associated antibodies are studied to determine the cause. 

Ecografía cervical

Imaging tests. Thyroid ultrasound is often used to study the cause of hyperthyroidism, to see whether there are any nodules (nodular or multinodular goitre) or not (Graves' disease or thyroiditis). Thyroid scintigraphy may also be used to study the cause of thyrotoxicosis to see if the thyroid is overactive in general, if there are overactive (toxic) nodules, or if the thyroid is blocked or inflamed (thyroiditis). 

Información general de Thyroid diseases

Consulta toda la información relacionada con Thyroid diseases

Read more

Substantiated information by:

Felicia Alexandra Hanzu
Mireia Mora Porta

Published: 17 June 2021
Updated: 17 June 2021

The donations that can be done through this webpage are exclusively for the benefit of Hospital Clínic of Barcelona through Fundació Clínic per a la Recerca Biomèdica and not for BBVA Foundation, entity that collaborates with the project of PortalClínic.

Subscribe

Receive the latest updates related to this content.

Thank you for subscribing!

If this is the first time you subscribe you will receive a confirmation email, check your inbox

An error occurred and we were unable to send your data, please try again later.