Thyroid
Thyroid disorders are common and can contribute to tiredness, mood changes and weight problems. These markers help assess how well the thyroid gland is functioning.
Free T4 (thyroxine)
Free T4 measures the unbound form of thyroxine, one of the main hormones produced by the thyroid gland. It is interpreted with TSH to assess thyroid function.
Thyroid stimulating hormone (TSH)
TSH is produced by the pituitary gland and signals the thyroid to make thyroid hormones. It is one of the main markers used to assess whether the thyroid is underactive or overactive.