Thyroid Stim Immunoglobulin
This test detects thyroid-stimulating immunoglobulins (TSI), antibodies that mimic thyroid-stimulating hormone and can cause excessive thyroid activity. It's ordered when Graves' disease is suspected based on symptoms like fatigue, heart palpitations, heat intolerance, or unexplained weight loss, or to monitor disease status in known cases.
Undiagnosed Graves' disease can significantly impair athletic performance through uncontrolled metabolism, reduced exercise tolerance, cardiac arrhythmias, and prolonged recovery. TSI testing may be relevant for athletes experiencing unexplained fatigue, elevated resting heart rate, or performance decline despite adequate training, though this is not a routine performance marker for healthy individuals.
Turnaround Time
3 days (up to 7 days)
Method
The IMMULITE 2000 TSI assay designed for the specific Semi- Quantitative detection of stimulating autoantibodies using a bridging format and human TSH receptor fragment chimeric recombinant proteins. The capture and detection proteins are designed to be specific for antibodies that stimulate the nat
Order online
Choose your lab and check out. We send your lab requisition automatically — no doctor visit needed.
Get your sample collected
Visit a lab service center near you for a quick blood draw (or book at-home phlebotomy where available).
See your results
Your results land in your Insider portal, ready to review and act on — that easy.
Your price
$90.00$270
3.0× less than retail
Versus the typical direct-to-consumer retail price for this test (illustrative — consumer prices vary by provider and region).
$90.00
Peer-reviewed sources supporting the educational content on this page.
Thyroid Stim Immunoglobulin
This test detects thyroid-stimulating immunoglobulins (TSI), antibodies that mimic thyroid-stimulating hormone and can cause excessive thyroid activity.
The Thyroid Stim Immunoglobulin test starts at $90.00 at Labcorp. No doctor's visit and no insurance needed; we do not bill insurance. Fitomics Insider members pay from $80.00.
Results for the Thyroid Stim Immunoglobulin test are typically ready about 3 days after your draw, and up to 7 days for some samples. Your results land in your Insider portal.
No. When you order the Thyroid Stim Immunoglobulin test from Fitomics Research Labs, a licensed physician in our 50-state network reviews and signs your requisition after checkout, and it lands in your portal and inbox. Then visit any Labcorp, Quest, or BioReference patient service center for your draw; results post to your Insider portal.
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