New England · TSI Test - Thyroid Stimulating Blood Test
TSI Test - Thyroid Stimulating Blood Test in Connecticut
TSI Test - Thyroid Stimulating Blood Test can be ordered without a referral from your own doctor, and this guide covers what to expect. A TSI test measures thyroid stimulating immunoglobulin, an antibody that can overstimulate the thyroid gland. It is typically used to help evaluate causes of an overactive thyroid.
Lab requirements in Connecticut
Here is what you need before ordering and completing the TSI Test - Thyroid Stimulating Blood Test in CT. Review each item and confirm the details with the collection lab.
- Physician's order
- Included. A physician's order is required for lab testing and is provided for you by our partner's physicians — no referral from your own doctor is needed.
- Fasting
- Some tests require fasting or avoiding certain foods or drinks beforehand. You will be informed when you order — confirm the details with the collection lab.
- Preparation
- Preparation is usually not required, but you should follow the specific instructions provided by the collection lab. This may include fasting or avoiding certain medications, depending on…
- Sample & visit
- A blood and/or urine sample is collected; the visit usually takes about 10 minutes.
- Identification
- Bring the lab requisition form from your account. The collection lab may also ask for a government-issued photo ID.
- Turnaround
- 1-3 business days
- Availability
- Our partner lab does not serve ND, RI, NY, NJ, MD or HI. Confirm availability for your location with the collection lab.
Before you go
- Order your test before visiting a lab, then use the requisition form in your account.
- Print the requisition form, or fax it to the lab directly from your account.
- No scheduling is needed — visit the collection lab during its normal business hours.
- A blood and/or urine sample is collected; the visit usually takes about 10 minutes.
- Bring a government-issued photo ID in case the lab requests it.
- Results are posted to your secure account within 1–3 business days.
Requirements are summarized from our partner lab's published policies. Preparation and availability can change — confirm current instructions with the collection lab before your visit.
What this test is
The TSI test detects and measures thyroid stimulating immunoglobulin in the blood. This antibody can mimic thyroid stimulating hormone and cause the thyroid to produce excess hormone. It is most often used to help identify autoimmune-related thyroid overactivity.
What it measures
- Thyroid stimulating immunoglobulin (TSI) — Reflects the level of an antibody that can stimulate the thyroid gland
What the test involves
A blood sample is collected from a vein in your arm using a standard blood draw. The sample is then sent to a laboratory for analysis.
Why it is often ordered
A clinician may order a TSI test when thyroid blood tests suggest overactivity or when an autoimmune cause is suspected. It can also be used to monitor a known thyroid condition over time.
Preparation
Preparation is usually not required, but you should follow the specific instructions provided by the collection lab. This may include fasting or avoiding certain medications, depending on the lab's protocol.
How results are reported
Results are reported as a numeric value with a reference range that varies by laboratory. Your clinician will interpret the result in the context of your symptoms and other thyroid tests.
Before you go
- Whether any medications or supplements should be avoided before the test
- If fasting or other preparation is needed
- How and when results will be shared with you
Cities
TSI Test - Thyroid Stimulating Blood Test in Connecticut communities
Choose your city for local context and to order this test.