TSH Receptor Antibodies (TRAb)
TSH receptor antibodies (TRAb, also called TRAK) are autoantibodies that bind the receptor for thyroid-stimulating hormone on thyroid cells. They are measured mainly to investigate an overactive thyr…
Category: Thyroid Panel
Also known as: trab, trak, tsh receptor antibodies, tsh receptor ab, thyrotropin receptor antibodies, thyrotropin receptor ab, tshr ab, anti-tsh receptor
Reference range: 0 — 0 IU/L (Source: ABIM)
Standard unit: IU/L
High values may indicate
Raised TSH receptor antibodies are most often associated with Graves' disease, the commonest cause of an overactive thyroid, and are sometimes used to follow how that condition changes over time or during pregnancy.
Low values may indicate
Low or undetectable TSH receptor antibodies are the usual finding and make Graves' disease less likely, though they do not on their own rule out other thyroid conditions.
Frequently asked questions
- What is a normal TSH Receptor Antibodies (TRAb) level?
- A typical reference range for TSH Receptor Antibodies (TRAb) is 0 — 0 IU/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 Receptor Antibodies (TRAb) measured in?
- TSH Receptor Antibodies (TRAb) is most commonly reported in IU/L. Labs in different countries may use other units — you can convert between them with BloodId's blood test unit converter.
- Where do TSH Receptor Antibodies (TRAb) 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 Receptor Antibodies (TRAb) over time?
- Yes. Upload results from any lab and BloodId charts your TSH Receptor Antibodies (TRAb) over time against its reference range, so you can see whether the trend is rising, falling, or stable.
Related biomarkers
Source: MedlinePlus, U.S. National Library of Medicine
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