Quick Facts
- Sample: Blood
- Fasting: No fasting required. Stop biotin consumption at least 72 hours prior to the collection.
- Turnaround: 1-3 business days. May take longer based on weather, holiday or lab delays.
What This Test Measures
This test measures thyrotropin receptor antibody (TRAb), an autoantibody directed against the thyroid cell receptor for thyroid-stimulating hormone. This is an antibody test, not a direct measurement of thyroid hormone levels such as T3 or T4. The presence of this antibody reflects an immune response that can drive thyroid cell activity rather than the amount of hormone your thyroid is producing.
Thyrotropin receptor antibody can be detected in most patients with Graves' disease and plays a role in the underlying process of that condition. It is also found in some individuals with normal thyroid hormone levels who have Graves' disease. This test result is reported as an antibody measurement and should be distinguished from thyroid hormone testing or thyroid-binding protein testing.
Benefits
- Identifies presence of thyrotropin receptor autoantibodies
- Supports evaluation related to Graves' disease
- May assist in prediction of hyperthyroidism relapse
- May assist in prediction of neonatal hyperthyroidism risk
- Provides antibody information distinct from thyroid hormone levels
Who Is This Test For?
- Adults being evaluated for Graves' disease
- Individuals with a healthcare provider monitoring thyroid autoimmune activity
- People with a history of hyperthyroidism being assessed for relapse risk
- Pregnant individuals whose provider is assessing neonatal hyperthyroidism risk
- Individuals whose provider wants antibody information alongside other thyroid findings
How It Works
- Order Your Test Online
- Visit a Local Lab
- Get Results Online
FAQ
1. What is the purpose of this thyroid test?
This test measures thyrotropin receptor antibody (TRAb), an autoantibody that targets the thyroid’s receptor for thyroid-stimulating hormone. It may help a healthcare provider evaluate immune activity associated with Graves’ disease. This test measures an antibody rather than thyroid hormone levels and does not diagnose a condition on its own.
2. When might I consider ordering this test?
You may consider this test as part of an evaluation for Graves’ disease or when your provider is monitoring the risk of hyperthyroidism relapse. It may also be used when a provider is assessing neonatal hyperthyroidism risk in pregnancy.
3. How does this test differ from other thyroid tests?
This test measures TRAb, an antibody, rather than thyroid hormone levels such as T3 or T4 or a thyroid-binding protein. It reflects immune activity directed at the thyroid’s TSH receptor and does not provide the same information as TSH, T3, or T4 testing.
4. Do I need to fast or prepare before this test?
No fasting is required. Stop biotin consumption at least 72 hours before collection.
5. How quickly will I get results?
Results are typically available in 1–3 business days. Weather, holidays, or laboratory delays may extend this timeframe.
6. How do I interpret the results?
The meaning of your TRAb result depends on your symptoms, medical history, medications, supplements, and other laboratory findings. It is often interpreted alongside other thyroid measurements. An abnormal result does not automatically confirm a thyroid condition, and a normal result does not rule one out. Because it measures an antibody, it should not be interpreted as a direct measure of thyroid hormone levels.
Disclaimer: Reference ranges may vary by laboratory. Listed ranges are general guidelines and may differ from those used by the performing lab. Always consult your healthcare provider for interpretation.
7. What should I do if my result is outside the expected range?
Review the result with a qualified healthcare provider. They can determine whether further evaluation is appropriate. Do not stop prescribed medication unless instructed by your healthcare provider.
8. How often should I get tested?
Testing frequency depends on your health status and reason for testing. Follow your healthcare provider’s guidance, as there is no fixed retesting schedule for this test.
Pre test preparation
No fasting required. Stop biotin consumption at least 72 hours prior to the collection.
Do not stop prescribed medication unless instructed by your healthcare provider.
