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Thyroid

TSH Receptor Antibodies

TRAb antibodies are associated with Graves' disease and may affect thyroid function. For women, these antibodies are especially relevant during pregnancy planning, as they can cross the placenta. Understanding your TRAb status may support informed reproductive health decisions.

Doctor's Assessment Included

Reference Ranges

No established reference range

There is no generally accepted reference value for TSH-receptor antibodies. The NVKC states that no general normal values are available: reference values depend on the assay used and differ between laboratories. The Dutch thyroid guideline therefore states that an absolute cut-off cannot be formulated, because the available assays are not standardised against one another. In practice the upper limits used by Dutch laboratories for this one test span more than a five-fold range, and even the unit printed on the report differs (E/l, U/l, IU/l, kU/l and AU/l are all used for the same quantity). So do not convert your result. The guideline judges the result relative to the laboratory itself: a value above three times the performing laboratory's own upper limit is considered clinically relevant, and that laboratory states its upper limit on your report. Discuss your result with your GP.

Unit: kU/l

Reference ranges may vary between laboratories. When you order a test, a BIG-registered doctor assesses your personal results in context. For treatment decisions, discuss your results with your GP.

What It Measures

This test measures antibodies that bind to the TSH receptor on thyroid cells. These may include stimulating antibodies that cause overactive thyroid function or blocking antibodies that may reduce thyroid activity. TRAb testing is commonly used by healthcare providers to evaluate and monitor autoimmune thyroid disease.

Why It Matters

For women, TRAb testing holds particular significance due to the potential impact on fertility and pregnancy. These antibodies can cross the placenta and may affect the baby's thyroid function. Your healthcare provider may recommend TRAb monitoring before and during pregnancy if you have a history of Graves' disease.

When to Test

Your healthcare provider may recommend TRAb testing when Graves' disease is suspected, to differentiate between causes of hyperthyroidism, to assess relapse risk after completing antithyroid medication, or during pregnancy when there is a history of Graves' disease. Timing of testing may depend on your specific clinical situation.

Symptoms

Low Levels

Low or undetectable TRAb levels are generally considered normal and typically do not cause symptoms. The absence of these antibodies may suggest that Graves' disease is less likely as a cause of hyperthyroidism. Your healthcare provider will consider other factors alongside TRAb results for a comprehensive assessment.

High Levels

Some people with elevated TRAb may experience symptoms of hyperthyroidism, including unexplained weight loss, rapid or irregular heartbeat, anxiety, tremors, excessive sweating, heat intolerance, or Graves' eye disease. Symptoms may vary depending on whether the antibodies are stimulating or blocking. Consult your healthcare provider for evaluation.

Lifestyle Tips

While lifestyle measures alone may not directly reduce TRAb levels, some people find that stress management, adequate sleep, a balanced diet, and avoiding smoking may support overall thyroid health. Selenium supplementation has been studied in relation to Graves' eye disease. Always consult your healthcare provider before starting supplements or making significant changes.

Frequently Asked Questions

What is the difference between TRAb and TSI?
TRAb is a broader category of antibodies that bind to the TSH receptor, which may include both stimulating and blocking types. TSI specifically measures the stimulating antibodies. Your healthcare provider may request one or both tests depending on the clinical question being addressed.
Can TRAb levels predict Graves' disease relapse?
Research suggests that TRAb levels measured at the end of antithyroid medication treatment may help predict the likelihood of relapse. Higher levels at treatment completion may be associated with greater relapse risk. Your healthcare provider can discuss what your specific results mean for your prognosis.
Why are TRAb levels monitored during pregnancy?
TRAb antibodies can cross the placenta and potentially affect the baby's thyroid function. Monitoring TRAb levels during pregnancy, particularly in the third trimester, may help your healthcare provider assess and manage any risk to the baby. Discuss pregnancy-related thyroid monitoring with your provider.

Test Products

This marker is included in the following test panels.

TSH Receptor Antibodies

€65,-