TSH
TSH (thyroid-stimulating hormone) is produced by the pituitary gland and regulates how much thyroid hormone the thyroid gland makes. It is the primary screening test for thyroid function.
Category: Thyroid Panel
Also known as: tsh, thyroid stimulating hormone, thyrotropin, Thyrotropic hormone, tireostimulišući hormon
Reference range: 0.4–4 mIU/L (Source: ABIM)
Standard unit: mIU/L
High values may indicate
High TSH may indicate hypothyroidism (underactive thyroid), Hashimoto's thyroiditis, or pituitary tumors that overproduce TSH.
Low values may indicate
Low TSH may indicate hyperthyroidism (overactive thyroid), Graves' disease, excessive thyroid medication, or pituitary gland dysfunction.
Frequently asked questions
- What is a normal TSH level?
- A typical reference range for TSH is 0.4–4 mIU/L (source: ABIM). Reference ranges vary by laboratory, age, and sex, so always compare against the range on your own lab report.
- What units is TSH measured in?
- TSH is most commonly reported in mIU/L. Labs in different countries may use other units — you can convert between them with BloodId's blood test unit converter.
- Where do TSH reference ranges come from?
- BloodId uses ABIM standard reference ranges and educational information from MedlinePlus (see our methodology). Reference ranges still vary by lab, age, and sex, so always compare against your own report.
- Can I track TSH over time?
- Yes. Upload results from any lab and BloodId charts your TSH over time against its reference range, so you can see whether the trend is rising, falling, or stable.