Thyroid Function Test
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Thyroid Function Tests - TFT 

Thyroid Blood Test

The thyroid function test is a blood test which checks the level of the hormones made by your thyroid gland and the levels of a hormone (TSH thyroid stimulating hormone) made by the pituitary gland in your brain. These two hormones finely balance the right amount of thyroxine production in the thyroid gland to maintain healthy bodily functions.

At Walk in Clinic, we provide thyroid function tests with same-day results in London. We offer accurate, convenient and quick tests at an affordable rate.


Same day appointments, as much time as you need with the doctor and instant referrals to our network of Consultant Specialists.

If you are experiencing health concerns, you don't have to wait any longer.

What is Thyroid Gland?

The thyroid is a small butterfly shaped gland at the front of your neck below the voice box. It releases hormones that get produced into your stream. These hormones will regulate metabolism of your body and help keep bodily functions such as – breathing, heartbeat, digestion, body weight, cholesterol levels, menstrual cycle and temperature working normally.

How Will It Work?

The thyroid gland in your endocrine system produces and secretes hormones into the blood.

The production of these hormones is generally triggered due to the release of Thyroid Stimulating Hormone or (TSH) from the pituitary gland in your brain.

The thyroid gland can be overactive – resulting in hyperthyroidism or underactive – resulting in hypothyroidism.

These conditions usually have different physical manifestations.

If the thyroid hormone levels in your blood are unusual, then prescription medication might be needed for this imbalance. The treatment may be effective in balancing thyroid hormones that can cause significant improvement in overall well-being.

When You Need To Get Tested

If you are experiencing any of the symptoms below, or you have a medical history of thyroid disorders, then schedule an appointment with your private GP and get a thyroid blood test done.

Hyperthyroidic Symptoms

The symptoms of hyperthyroidism or an overactive thyroid are the following:

  • Restlessness, difficulty sleeping, nervous, emotional and irritable.
  • Hand tremors.
  • Losing weight despite an increased appetite.
  • Heart palpitations.
  • Shortness of breath.
  • Feeling tired all the time and muscle weakness
  • Fertility issues
  • Unusual bowel movements
  • An increased thirst, sweating and always feeling hot.
  • Diarrhoea or needing to go more often.
  • Hair thinning and itchy skin.
  • Menstrual periods light or infrequent.
  • A swelling of your thyroid gland (goitre) in the neck.
  • Eye problems if you have Graves' disease.
  • Osteoporosis

Hypothyroidic Symptoms

The symptoms of hypothyroidism or an underactive thyroid include:

  • Tiredness
  • Weight gain.
  • Constipation.
  • Muscle aches and pains.
  • Feeling cold.
  • Increased Cholesterol
  • Hair loss
  • Fertility problems
  • Mood swings
  • Scaly dry skin
  • Lifeless hair.
  • Fluid retention.
  • Mental slowing.
  • Depression.
  • Dry skin and hair
  • Breathlessness issues
  • Insomnia
  • Low basal temperature

We Provide These Thyroid Blood Tests in London:

  • TSH Blood Test - TSH denotes “Thyroid Stimulating Hormone” and the test calculates how much of the hormone is present in the blood.
  • Triiodothyronine (T3) Test – A T3 test is performed as part of an evaluation of thyroid function. It measures the blood level of the hormone T3 (triiodothyronine).
  • Thyroxine (T4) Test - T4 also called Thyroxine is the hormone produced from thyroid gland. The test will help to measure the level of T4 in your blood.


Tests Price Turnaround

TSH Blood Test

£63 24 hours

Triiodothyronine (RT3) Test

£156 24 hours

Thyroxine (T4) Test

£57 24 hours


Same day appointments, as much time as you need with the doctor and instant referrals to our network of Consultant Specialists.

If you are experiencing health concerns, you don't have to wait any longer.

Why You Need to Check For Thyroid

  • You are worried about having an overactive or underactive thyroid.
  • You suffer from muscle weakness, lack of energy and fatigue.
  • You detect the function of thyroid to evaluate the progress of your present condition.
  • You have experienced weight gain or weight loss and want to know the reason behind it.

Benefits of Thyroid Testing

Many people suffer from a thyroid disorder and a thyroid function test including, T3 and T4 test is a quick and an accurate way to detect if you have a thyroid imbalance.

With accurate and relevant blood testing, you will have the information needed to be able to take necessary steps or assessing the problem and alleviating the symptoms that usually occur with it.

Book Your Thyroid Function Blood Test Now

Walk In and Self Request blood tests for more than 1000 conditions. If you need to get in touch with a private GP about TFT blood test or any other reason, book an appointment at our walk-in clinic today!



Suite 2, 117a Harley Street, London W1G 6AT


020 70968853

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Mon - Fri 9:00 - 18:00

Sat - Sun 10:00 - 14:00