Thyroid Stimulating Hormone Levels and Tests: The Normal Range

by | Mar 12, 2024

Gain clarity on thyroid health with insights into normal Thyroid Stimulating Hormone (TSH) levels and ranges. Understand what TSH tests for thyroid function assessment mean and the optimal TSH levels for your health and well-being. Empower yourself with knowledge about interpreting TSH test results and their implications.

Asian patient undergoing ultrasound of thyroid nodules and gland

Introduction to Thyroid Hormone

We all know that the human body is a complex organism that has various systems that help ensure we are healthy and live as long and happy of a life as possible. One of the aspects of our bodies that we need to make ourselves aware of is the thyroid hormone. It plays a significant role in our lives, and it is often overlooked by the average person.

The National Library of Medicine offers the following explanation about what the thyroid hormone is all about:

“The thyroid hormone is well known for controlling metabolism, growth, and many other bodily functions. The thyroid gland, anterior pituitary gland, and hypothalamus comprise a self-regulatory circuit called the hypothalamic-pituitary-thyroid axis.”

Those are some essential aspects related to living a healthy life. With that in mind, it is important to understand how you can monitor this aspect of your health.


TSH Test

One of the best ways to detect if you may have a thyroid issue is to take a TSH test. This is a blood test that helps detect the level of the thyroid hormones in your body. If your levels are too high or too low, this could indicate that you have a thyroid issue that needs to be examined more carefully.

The test is used to determine if you have hyperthyroidism or hypothyroidism. The first refers to having too much of the hormone in your system and the latter indicates that you might have too little of the hormone.

Medlineplus.gov makes the note that it is essential to understand that while the TSH test can tell you if you have too much or too little of the hormone, it cannot tell you what is causing the thyroid problem. It is simply used as an indicator that you may have a problem to take a look at.


Types of Thyroid Tests

There are a few different types of thyroid hormone tests that you may have conducted to determine if you have a thyroid issue. These include:

  • TSH Test – The previously mentioned TSH test is the first test likely to be ordered by your doctor to determine if there is an issue.
  • T3 and T4 – These tests determine the levels of various thyroid hormones in your blood.
  • Thyroid antibodies test – This test can be used to help diagnose certain autoimmune thyroid issues.

Speak with your doctor about which of these various tests are right for you.


What is the Normal Thyroid Hormone Level?

The thyroid hormone levels that are considered normal are within a range of 0.5 to 5.0mlU/L. That is for your TSH levels. Note that FT4 normal values range from 0.7 to 1.9ng/dl, T3 normal levels are from 80-220ng/dL and T4 normal levels are between 5.0 to 12.0ug/dL.

Ask your doctor about these values and how your values fit within the ranges.


What Do These Tests Mean or Indicate?

Your test results could indicate a variety of potential health conditions related to your thyroid, including:

  • Primary hypothyroidism – Low thyroid hormone levels caused by the destruction of your thyroid gland.
  • Subclinical hypothyroidism – Mild thyroid failure, something that should be treated ASAP to prevent worsening damage.
  • Primary hyperthyroidism – The overproduction of thyroid hormones due to thyroid gland issues.
  • Early or mild hyperthyroidism – Long-term low levels of TSH levels.
  • Thyroiditis – Inflammation within the thyroid gland.
  • Pituitary disease – Could potentially lead to a host of issues included pituitary tumors.

No matter which particular issues your tests may indicate, it is vital to get them resolved as soon as possible. We invite you to reach out and contact the Supreme Vascular and Interventional Clinic in Singapore to learn which thyroid tests are right for you.

Thyroid Nodule Radiofrequency Ablation (RFA) Treatment

Radiofrequency ablation aims to give patients a non-surgical option for treating thyroid nodules. This procedure is a minimally invasive option that a surgeon can perform, should the preliminary tests determine that you would benefit from it.
The Advantages of RFA of Thyroid Nodules
The major advantages of the technique are as below.

  1. It is done as day surgery procedure under light sedation.
  2. It takes about 45 minutes to one hour to complete the entire procedure.
  3. Patients are discharged the same day.
  4. Normal thyroid tissue adjacent to the nodule is preserved.
  5. It does not affect thyroid function.
  6. Multiple nodules can be treated at same time.
  7. The treated nodules do not regrow again.
  8. No surgical scar with needle mark on the skin.
  9. Quick recovery and back to full activity and normal lifestyle.
  10. The technique is suitable to treat even large thyroid nodules.

Find out how thyroid nodule Radiofrequency Ablation can help you in a minimally invasive way on our blog post, “Thyroid Nodule Radiofrequency Ablation Treatment: Diagnosis,  Management, and Recovery.”

Find the Right Doctor

From family and internal medicine to specialist, Dr. Manish Taneja is the best in the field. As a vascular and interventional radiology specialist, Dr Manish Taneja looks after peripheral vascular disease, aneurysms, dialysis interventions, venous diseases like deep vein thrombosis, and varicose veins/spider veins/reticular veins. He is also competent in performing newer endovascular procedures such as uterine artery embolization, prostate artery embolization, genicular artery embolization, and erectile dysfunction interventions. Dr. Manish Taneja also has extensive experience in performing all vascular interventions, non-vascular interventions and interventional oncology procedures.

Read More About Vascular Treatments on Our Blog

To dive deeper into the types of vascular treatments such as thyroid nodule radiofrequency ablation, head over to our clinic’s blog.  Read our recommended vascular treatments related blog posts to stay informed.

Thyroid Nodule Resources

How to Keep Thyroid Healthy for Optimal Well-Being

As part of the endocrine system, the thyroid hormones must be perfectly balanced at all times for the body to function normally.

Woman holding and using megaphone

Caring For Your Thyroid Health

Have you ever experienced difficulty swallowing or breathing? You may have risk factors including a family history of thyroid nodules or iodine deficiency. Thyroid nodules are abnormal lumps (growths) within the thyroid gland, a butterfly-shaped gland located below your voice box. Even if most thyroid nodules are benign, 10-15% of nodules are cancerous. Sometimes overgrowth of normal thyroid tissue can lead to hyperthyroidism. In other cases, multiple nodules can form in the thyroid called multinodular goiter. Fluid filled thyroid cysts can be one type of thyroid nodule within the thyroid. More complex nodules may lead to thyroid cancers. Depending on the root cause and type of nodule you have, patients can monitor with regular ultrasound or even have a thyroid fine needle aspiration biopsy (FNAC) if required. Surgery to remove partial or whole thyroid gland can be done but thanks to minimally invasive treatments such as Radiofrequency Ablation (RFA), this procedure can treat noncancerous and cancerous thyroid lumps.

Types of Thyroid Nodules and Cancer

Watch our video guide and find out more on our blog post, “Types of Thyroid Nodules and Cancer” with the types, causes, evaluation, biopsy, treatment options, and when to see a thyroid specialist. Find answers to questions on whether thyroid nodules are cancerous or not.

Arrange Your Appointment

Consult Vascular Specialist, Dr. Manish Taneja

Other Health Conditions

The Supreme Vascular and Interventional Clinic is your “go-to” facility for various conditions and pain management. To arrange an appointment with Dr. Manish Taneja, our thyroid nodule specialist, contact us. You can also call us at (+65) 6904 8084 for a consultation.