TSI Test in Washington
TSI Test can be requested without a referral, and this overview covers what to expect. The TSI (Thyroid-Stimulating Immunoglobulin) test is a blood test that measures antibodies that can overstimulate the thyroid gland. It is most often ordered to help diagnose Graves' disease, an autoimmune condition that causes hyperthyroidism, and to monitor treatment response. Across Washington, part of Pacific, the tsi test can be ordered directly and collected at a certified site — no referral required.
- Sample type
- blood
- Category
- Thyroid
- Turnaround
- 1-3 business days
- Price
- $119
- Referral
- Not required
The TSI (Thyroid-Stimulating Immunoglobulin) test is a blood test that measures antibodies that can overstimulate the thyroid gland. It is most often ordered to help diagnose Graves' disease, an autoimmune condition that causes hyperthyroidism, and to monitor treatment response.
What it measures
- TSI level — The amount of thyroid-stimulating immunoglobulin in the blood; higher levels suggest Graves' disease.
- TSI index — A calculated ratio that compares your TSI level to a reference standard, helping interpret results.
- TSI percentage — Sometimes reported as a percentage of a normal reference range, indicating relative antibody activity.
- Thyroid-stimulating antibody (TSAb) — A related antibody that may be measured alongside TSI to assess thyroid stimulation.
Who it is for
A doctor typically orders a TSI test when you have symptoms of hyperthyroidism, such as unexplained weight loss, rapid heartbeat, or tremors, or when other thyroid tests suggest Graves' disease.
Preparation
No fasting or special preparation is needed for a TSI test. You can eat and drink normally before your blood draw.
Results and what they mean
Results are usually reported as a number or percentage, with a reference range provided by the lab. Your clinician will interpret your TSI level along with your symptoms and other thyroid tests. This information is general and not a substitute for medical advice.
Requesting the TSI Test in Washington
Order online, choose a certified collection site in Washington, and review results through a secure portal. No referral is required, and orders are processed confidentially. Because the region is uneven, coastal metros, inland towns, and rural counties with very different access to testing — worth planning around when you book.
Frequently asked questions
What does a high TSI level mean?
A high TSI level often points to Graves' disease, but only your doctor can confirm a diagnosis after reviewing all your test results and symptoms.
Do I need to fast before a TSI test?
No, fasting is not required. You can eat and drink as usual before the blood draw.
How long does it take to get TSI test results?
Results are typically available within 1 to 3 business days, though this can vary by laboratory.
Can TSI levels change over time?
Yes, TSI levels can rise or fall with treatment or over the course of the condition. Your doctor may repeat the test to monitor changes.
TSI Test by city in Washington
- TSI Test in Seattle
- TSI Test in Spokane
- TSI Test in Kennewick
- TSI Test in Bremerton
- TSI Test in Tacoma
- TSI Test in Olympia
- TSI Test in Vancouver
- TSI Test in Marysville
- TSI Test in Bellevue
- TSI Test in Kent
- TSI Test in Yakima
- TSI Test in Bellingham
- TSI Test in Everett
- TSI Test in Renton
- TSI Test in Spokane Valley
- TSI Test in Federal Way
- TSI Test in Kirkland
- TSI Test in Auburn
- TSI Test in Pasco
- TSI Test in Redmond
- TSI Test in Wenatchee
- TSI Test in Longview
- TSI Test in Mount Vernon
- TSI Test in South Hill
- TSI Test in Sammamish
- TSI Test in Lakewood
- TSI Test in Richland
- TSI Test in Shoreline
- TSI Test in Lacey
- TSI Test in Burien
- TSI Test in Bothell
- TSI Test in Edmonds
- TSI Test in Puyallup
- TSI Test in Issaquah
- TSI Test in Lynnwood
- TSI Test in Parkland
- TSI Test in Lake Stevens
- TSI Test in Spanaway
- TSI Test in University Place
- TSI Test in Walla Walla