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Thyroid Tests Procedure
Thyroid Tests Procedure

Procedure and Results of Various Thyroid Tests

Have you been recently advised by your physician to take a thyroid test? You will find all the information related to the thyroid gland and tests required to determine any abnormality present here. It is a common scenario these days and therefore you can get yourself tested in any clinic.

The thyroid gland is present in the front part of your neck. It is made up of 2 lobes present on the either side of the windpipe, joined with the help of a small bridge called isthmus. It produces hormones that are necessary for the metabolism.

Why have a thyroid test?

This test is generally advised if the patient is suffering from any of the following symptoms:

  • Hair loss
  • Dry skin
  • Tremors
  • Increase in heart rate
  • Sudden loss or gain in weight
  • Unable to sleep
  • Abnormal periods
  • Anxiety
  • Intolerant to cold

These tests are performed to determine if the gland is functioning properly or not.

Thyroid Stimulating Hormone (TSH)

This particular test is done to measure the amount of TSH in the blood, so as to monitor any abnormality such as hypothyroidism and hyperthyroidism.

The patient should fast overnight and if you are on any kind of medication, inform your doctor before the blood test for thyroid begins.

Normal TSH: 0.5 - 4.5 mIU/L

Thyroxine or T4

This hormone is necessary for metabolism and growth of the body. The test to determine the amount of thyroxine is ordered if the physician finds any abnormality in your TSH levels.

Overnight fasting is mandatory, in case you are on any medication or oral contraceptives then inform your doctor prior to the test

Normal T4 level: 4.5 - 11.2 msg/dl

Triiodothyronine or T3

It has similar effects as that of thyroxine but it has a much stronger effect than T3.

Before the blood tests for thyroid begins, it is important that you fast the previous night and inform your doctor in case you are on any kind of medication.

Normal T3 level: 2.3 - 4.2 pg/ml

Thyroid scan

This test determines if there are any lumps present in the gland. It uses radionuclides that emit gamma rays, which can be either swallowed or taken in the form of injection. The radiation used in this test is safe for the body and similar to that of X-ray. You can get this test done in any of the renowned private gp clinic in London.

This test should be avoided in case you are pregnant or breastfeeding.

You will be asked to fast and stop taking your thyroid medication from a week before your test is scheduled. Apart from this, you will be asked to avoid eating shellfish as the iodine content in them might interfere with the results.

Fine Needle Aspiration Cytology or FNAC

This test is necessary if you have a swelling on your throat. A needle will be used to collect a sample from the area to determine the abnormality present.

There is no prerequisite before the test unless you are ordered to go for an ultrasound before the test. The cost associated with this test varies upon the clinic greatly.

Book an appointment with our private GPs in London for more information about the procedure and results of various Thyroid Tests.