Free Thyroid Profile (FT3, FT4)
Also known as: FTFT
Tests included in this profile 2
- Free Tri-iodothyronine (FT3) Contact for price
- Free Thyroxine (FT4) Contact for price
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
Free T3 and Free T4 measure the active, unbound thyroid hormones that your body can actually use. They give a more accurate picture than total T3/T4, especially in pregnancy or when protein levels are abnormal.
Why is this test done?
- Confirm thyroid disorders
- Check thyroid when TSH is abnormal
- Monitor treatment
- Thyroid testing in pregnancy
Symptoms — when should you get tested?
- Tiredness or restlessness
- Weight change
- Palpitations
- Hair fall
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 free hormones mean an overactive thyroid.
Common reasons- Graves' disease
- Thyroiditis
- Too much thyroid medicine
If your result is low
Low free hormones mean an underactive thyroid.
Common reasons- Hashimoto's thyroiditis
- Iodine deficiency
- Pituitary problems
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.
Save more with a health package
This test is also included in these checkups along with many other tests.
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.