Lab Tests for Graves' Disease
Graves' disease is an autoimmune disorder that causes your thyroid to produce too much hormone (hyperthyroidism). It is the most common cause of hyperthyroidism in the United States. Lab testing for Graves' disease focuses on confirming overactive thyroid function and identifying the autoimmune trigger. Thyroid-stimulating immunoglobulins are the definitive marker, but a combination of TSH, Free T4, Free T3, and TPO antibodies provides a comprehensive picture. JustLabs lets you order these tests online without a doctor visit at transparent, affordable prices.
Recommended Tests
Understanding Your Results
| Test | Normal Range | Low Means | High Means |
|---|---|---|---|
| TSH | 0.4–4.0 mIU/L | Overactive thyroid — consistent with Graves' | Unlikely in active Graves' disease |
| Free T4 | 0.8–1.8 ng/dL | Thyroid function may be normalizing | Excess hormone from Graves' stimulation |
| Free T3 | 2.3–4.2 pg/mL | Less common in active disease | Often the first hormone elevated in Graves' |
| TPO Antibodies | <35 IU/mL | Autoimmune component less likely | Supports autoimmune thyroid diagnosis |
How to Order
Order Online
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Get Results
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Frequently Asked Questions
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Content reviewed for accuracy by the JustLabs editorial team.