Thyroid Stimulating Hormone (TSH)

Fasting Required: No

Risk Assessment:

• High TSH: May indicate hypothyroidism (underactive thyroid)

• Low TSH: May suggest hyperthyroidism (overactive thyroid)

• TSH levels are also used to monitor thyroid hormone replacement therapy or treatment for hyperthyroidism.

Age Reference Range:

• Day of birth 3.84–11.75 mU/l

• 1 month 1.18–3.57 mU/l

• 1 year 1.17–3.55 mU/l 5 years

• 1.15–3.47 mU/l

• 12 years 1.09–3.31 mU/l

• 18 years 1.05–3.16 mU/l

• Adult 0.46 to 4.68 mIU/L

Test Result Interpretation:

• Low TSH levels: This can indicate that the thyroid is overactive (hyperthyroidism), where the thyroid produces too much hormone, leading to a decrease in TSH production from the pituitary gland.

• High TSH levels: This can suggest hypothyroidism, where the thyroid is underactive and the pituitary gland compensates by producing more TSH to stimulate the thyroid.

• Normal TSH levels: Typically indicate normal thyroid function, but additional tests (like free T3 and T4 levels) may be required to confirm normal thyroid health.

Sample Type:

• Blood sample: Typically drawn from a vein in your arm.