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Doctor's Assessment Included

Every result includes a professional assessment from a BIG-registered doctor. For treatment decisions, discuss your results with your GP.

Thyroid

TSH Receptor Antibodies

TRAb antibodies may indicate Graves' disease, which can cause hyperthyroidism. For athletes, an uncontrolled overactive thyroid can significantly impact heart rate, recovery, and body composition. TRAb testing may help identify the cause of unexplained performance changes.

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

Athletes with undiagnosed Graves' disease may experience elevated resting heart rate, excessive muscle breakdown, weight loss despite adequate nutrition, or heat intolerance during training. TRAb testing may help your healthcare provider identify the underlying cause and develop a treatment plan that supports your return to optimal performance.

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.