Thyroid
Anti-TRAB
LOINC 3685-5 · UI/L
Ranges
Reference range: ≤ 1.75 UI/L
What it is
TRAb (TSH-receptor antibodies) are antibodies that act on the thyroid's TSH receptor. They are the key marker of Graves' disease.
Why it matters
They help diagnose and monitor Graves' disease, the most common cause of an overactive thyroid.
What high values can mean
A higher value supports a diagnosis of Graves' disease and can help guide its management.
What low values can mean
A low or negative value makes Graves' disease less likely.
How to improve it
Antibody levels reflect the autoimmune process, not lifestyle; care focuses on thyroid function and treatment.
Food & lifestyle
No diet changes these antibodies; following your clinician's plan is the aim.
Preparing for the test
A blood test; fasting is not required — follow your lab's instructions.
When to talk to a doctor
Discuss a positive TRAb with a doctor, especially with symptoms of an overactive thyroid.
Related markers
Sources
- MedlinePlus (NIH)
- Testing.com (AACC)
Content reviewed on June 26, 2026
Medical disclaimer
This content is for educational purposes only. It is not medical advice and does not diagnose, treat, or prevent any condition. Reference ranges vary between laboratories — always use the range printed on your report and discuss your results with a healthcare professional.
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