Thyroid Stimulating Immunoglobulin (TSI) Blood Test

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Feature	Labcorp	Quest Diagnostics
Price	$132.99	$58.49
Results in	~4 business days	~5 business days
Sample type	Blood Serum	Blood Serum
Require fasting	No	No

About the test

Thyroid Stimulating Immunoglobulin (TSI) is an autoantibody that stimulates the thyroid gland to produce excess thyroid hormones. It is primarily used to diagnose and monitor Graves’ disease, a common cause of hyperthyroidism.

Included biomarkers & Reference ranges

Biomarker	Reference range
Thyroid Stimulating Immunoglobulin (TSI) An autoantibody that mimics TSH and overstimulates the thyroid. A key marker for diagnosing and monitoring Graves' disease.	—

Reference ranges vary by lab, age, and sex (M/F). Your report shows your exact range. Click any biomarker to see its optimal range and what your results mean.

How it works

1. Order online No referral or insurance
2. Get a requisition By email in 24–72 hours
3. Visit a draw center Bring a matching photo ID
4. Get results Securely by email

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

Consultations

Not sure how to read your results? We can help.

Schedule a consultation with a Hormunity specialist. We’ll walk through every marker, interpret what it means for you, and map out the next steps for your care.

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