TSH (Ultrasensitive)
Also known as: Thyroid stimulating hormone
How to prepare
You can eat and drink normally before the test.
Morning sample preferred.
Tell our phlebotomist about any medicines you take. Don't stop them without asking your doctor.
Wear a loose sleeve so the sample can be taken easily from your arm.
How it works
About this test
TSH (Thyroid Stimulating Hormone) is made by the pituitary gland in the brain and controls the thyroid. It is the most sensitive single test to screen for thyroid problems and to adjust thyroid medicine.
Why is this test done?
- First test to check thyroid health
- Adjust thyroxine dose
- Screening in pregnancy
Symptoms — when should you get tested?
- Tiredness
- Weight change
- Hair fall
- Irregular periods
- Feeling cold or hot all the time
Normal range
Reference ranges differ slightly between labs, methods, age and sex. Always discuss your report with your doctor.
If your result is high
High TSH means the thyroid is underactive (hypothyroidism).
Common reasons- Hashimoto's thyroiditis
- Iodine deficiency
- Thyroid medicine dose too low
If your result is low
Low TSH means the thyroid is overactive (hyperthyroidism) or too much thyroid medicine.
Common reasons- Graves' disease
- Thyroid nodules
- Thyroid medicine dose too high
How is the test done?
- 1Book online
Choose your slot for home collection or a visit to our centre.
- 2Blood sample taken
A trained phlebotomist takes a small blood sample from a vein in your arm with a sealed, single-use needle. It takes about 2 minutes.
- 3Tested in our lab
Your barcoded sample is tested on automated machines with strict quality checks.
- 4Report on WhatsApp
A pathologist checks the result and the report reaches you on WhatsApp and email.
Frequently asked questions
No fasting is needed for this test. You can eat and drink normally.
Your report is usually ready in same day after the sample reaches our lab. We send it on WhatsApp and email, and you can also download it from the Reports page.
Please call our team to confirm whether home sample collection is available for your location and test.
This test needs a blood sample. Morning sample preferred.