Thyroid-related laboratory abnormalities

Описание: Thyroid-related laboratory abnormalities

This video covers thyroid-related laboratory abnormalities, which can help you differentiate between various causes of hyper- and hypothyroidism using lab values like TSH, T4, and T3.

ADDITIONAL TAGS:
Disorder
TSH
Free T4
T3
Comment
Classic primary hyperthyroidism
Low
High
High
Graves disease (diffuse goiter, most common hyperthyroid), Plummer disease (multinodular), toxic adenoma
Subclinical hyperthyroidism
Low
Normal
Normal
Could also be central hypothyroidism, nonthyroidal illness, recovery from hyperthyroid, pregnancy
T3 toxicosis
Low
Normal
High
Graves (mild or early disease), exogenous T3, antithyroid medication
T4 toxicosis
Low
High
Normal
Amiodarone, levothyroxine (T4)
TSH producing tumor
Normal/High
High
High
Likely pituitary;
TSH=thyroid secreting hormone
Primary hypothyroidism
High
Low
Low
Hashimoto disease (most common hypothyroid), iodine deficiency
Secondary hypothyroidism
Low/Normal
Low
Low
Hypofunctioning pituitary
Subclinical hypothyroidism
High
Normal
Low
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