Hypothyroidism laboratory findings

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Hypothyroidism Main page

Patient Information

Overview

Classification

Primary hypothyroidism
Hashimoto's thyroiditis
Secondary hypothyroidism
Tertiary hypothyroidism

Differentiating different causes of hypothyroidism

Screening

Diagnosis

History and symptoms

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

To diagnose primary hypothyroidism, many doctors simply measure the amount of Thyroid-stimulating hormone (TSH) being produced. High levels of TSH indicate that the thyroid is not producing sufficient levels of Thyroid hormone (mainly as thyroxine (T4) and smaller amounts of triiodothyronine (fT3)).

Laboratory Findings

Electrolyte and Biomarker Studies

Although TSH levels can detect primary hypothyroidism, measuring just TSH fails to diagnose secondary and tertiary forms of hypothyroidism, thus leading to the following suggested blood testing if the TSH is normal and hypothyroidism is still suspected:

Additionally, the following measurements may be needed: