Low TSH-receptor antibody (TRAb / TSI): what it means
A TSH-receptor antibody (TRAb / TSI) result below the normal range is considered low. Here is what a reduced TSH-receptor antibody (TRAb / TSI) can point to, and when it is worth discussing with a doctor.
Reference range: negative <1.75 IU/L; a positive result confirms Graves' disease as the autoimmune cause of an overactive thyroid
Understand your full resultWhat a low TSH-receptor antibody (TRAb / TSI) can mean
- A negative result — makes Graves' disease unlikely; an overactive thyroid is then more likely due to another cause (a toxic nodule, or thyroiditis).
- A falling level on treatment — can suggest the autoimmune process is settling.
When to discuss with a doctor
The TSH-receptor antibody test is used when the thyroid is found to be overactive, to confirm whether Graves' disease is the cause — which directs treatment. A positive result establishes the diagnosis; a negative one points toward other causes that are managed differently. The antibody level also helps judge the likelihood of relapse after a course of medication, and it has a specific and important use in pregnancy, where a high level means the baby's thyroid should be monitored because the antibodies cross the placenta. This is interpreted by endocrinology alongside the thyroid hormone levels. Mediora.AI surfaces the TRAb result alongside TSH and the thyroid hormones so the Graves' pattern is visible; the diagnosis, treatment choice and any pregnancy monitoring belong with your doctor.
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Upload your test - freeMediora.AI is informational - interpretation, not a diagnosis. A single out-of-range value is common and often benign; always discuss decisions with your doctor.