Lab test

TSI Test - Thyroid Stimulating Blood Test

TSI Test - Thyroid Stimulating Blood Test can be ordered without a referral, and this guide covers what to expect. The TSI Test measures thyroid-stimulating immunoglobulin levels in the blood to evaluate thyroid function.

Sample typeBlood draw at a collection lab

ReferralNo referral required

What this test is

The TSI Test is a blood test that assesses the levels of thyroid-stimulating immunoglobulin (TSI). This immunoglobulin can influence thyroid activity, and the test helps in evaluating thyroid function.

What it measures

Thyroid-Stimulating Immunoglobulin (TSI) — reflects the stimulation of thyroid activity

What the test involves

The test involves a standard blood draw, typically from a vein in the arm. The sample is then analyzed in a laboratory.

Why it is often ordered

Clinicians generally order this test to investigate symptoms related to thyroid function. It helps in understanding whether the thyroid is being overstimulated by immunoglobulins.

Preparation

Preparation for the TSI Test may vary, so it's important to follow the specific instructions provided by the collection lab.

How results are reported

Results are reported as levels of TSI in the blood, and reference ranges can differ between laboratories. It's important to discuss results with a healthcare provider.

Before you go

Test preparation requirements
Sample collection procedure
Result reporting time

FAQ

Frequently asked questions

What does a high TSI level indicate?

A high TSI level may suggest increased thyroid activity, but interpretation should be done by a healthcare provider.

Is fasting required before the TSI Test?

Fasting is not typically required, but it's best to follow the specific instructions from the lab performing the test.

How long does it take to get TSI Test results?

Results are usually available within 1-3 business days, depending on the lab's processing time.

Can medications affect TSI Test results?

Certain medications may influence the results, so inform your healthcare provider about any medications you are taking.

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