Thyroid Stimulating Immunoglobulin (TSI)
- Category
- Thyroid
- Sample
- Blood sample taken from a vein in your arm
- Reports () Terms & Conditions Report time varies with time of sample collection.
- In 6 days
- Fasting
- No Fasting
- Age
- Above 5 Years
What Is This Test?
Measures thyroid-stimulating immunoglobulins (TSI), antibodies that switch on the thyroid gland.
Why this test is performed?
Diagnoses Graves' disease, distinguishes it from other causes of hyperthyroidism and assesses risk to the baby in pregnant women with Graves' disease.
Who should take this test?
Tiredness, weight gain or loss, hair fall, feeling cold or hot, irregular periods, anxiety/palpitations, infertility or pregnancy planning.
Test Preparation
No fasting needed.
Medical disclaimer · for information only, not medical advice
This article is for general information and education only. It is not medical advice, does not create a doctor–patient relationship, and is not a substitute for consultation with a qualified doctor who has assessed your individual situation. Never delay seeking medical advice because of something you have read here.
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- Report time: In 2 days
- No fasting
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- Report time: In 2 days
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- Report time: In 5 days
- No fasting
Frequently asked questions
It strongly suggests Graves' disease as the cause of an overactive thyroid.
No fasting is needed. You can eat and drink normally unless your doctor has advised otherwise.
Blood sample taken from a vein in your arm.
Usually within 4–5 days after the sample reaches the lab. You will receive the report online.
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