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Formal name: thyroid-stimulating hormone; thyrotropin
Related tests: T4; T3; FT4; FT3

At a Glance

Why Get Tested?

To screen for and diagnose thyroid disorders; to monitor treatment of hypothyroidism and hyperthyroidism

When to Get Tested?

For screening: All newborns are screened for congenital hypothyroidism. There is currently no recommendation in the UK for routine screening of adults
For monitoring treatment: as directed by your doctor
Otherwise: when a patient has symptoms of hypo- or hyperthyroidism and/or an enlarged thyroid

Sample Required?

A blood sample taken from a vein in the arm. For neonatal screening blood is collected by pricking the heel

Test Preparation Needed?

None required