Thyroid Diagnosis Using Thyroid Test & TSH Range

TSH or Thyroid Stimulating Hormone is a peptide hormone secreted by the pituitary gland into the blood. The main reason for the production of TSH in the TSH range is to balance the body’s thyroid levels. TSH is the key to the mechanism of production of Thyroid hormones. Only, when this TSH reaches the Thyroid gland (butterfly-shaped gland present at the base of the neck) it starts the manufacture of two most important hormones known as T3 and T4. This release of TSH from the pituitary gland is regulated by the Hypothalamus. (which sends the Thyrotropin-releasing hormone)

When the amount of TSH range required is reached, it follows a negative feedback mechanism o stop the loop of hormone release. Somatostatin which is also produced by the hypothalamus leads to this negative feedback mechanism. So, whenever there is a variation in any of the hormones mentioned we scrutinize the hormone imbalance of TSH levels. 

[READ MORE] Normal Thyroid Levels

TSH Range

Normal TSH range

The normal thyroid stimulating hormone range or normal TSH range alters in accordance with the gender of the subject. I.e, the TSH range is different for men and women. The ideal TSH level or TSH range also changes according to the age. For instance, there will be different in the TSH range of children, newborns, and adults. For your clear understanding of the normal TSH range, everything is explained in a simplified way. This article on TSH range also focuses on the normal TSH range, reference TSH Range, and the TSH range in our body when the thyroid gland is hyperactive and underactive. The normal TSH range for a normal healthy adult range from 0.4 to 4 mIU/L. 

Triggers Influencing the TSH range

Some of the triggers or risk factors can influence the TSH range in our body. This will change the STh range in our body with reference to the actual TSH ranges. The following mentioned are the triggers or common factors for the change in the Normal TSH levels

  • Inflammation or swelling of the thyroid gland
  • Genetics
  • Pregnancy
  • Deficiency or excess of iodine in the diet
  • Certain medications
  • Steroids
  • Thyroid cancer
  • Poisonous substances and
  • High Radiation exposure

[QUICK READ] Understanding the TSH Range

TSH Range in Men

  • The normal TSH range which is approved by many in the world for men between the age of 21‑54 is 0.4‑4.2 mIU/L.
  • Whereas for the men above the age of 54 and below 90 is between 0.5 to 8.9 mIU/L.

TSH levels for Children

  • The TSH range of a newborn baby and infant up to to 4 days is 1‑39 mIU/L
  • This TSH level will reduce as the days pass by and reach 1.7‑9.1 mIU/L
  • And the Range of TSH levels in the adolescence to teenage will be around 0.7‑64 mIU/L

TSH Range in Women

  • The normal TSH for women ranges from between 0.3–3.04.

TSH Range During Pregnancy

The TSH range varies greatly during pregnancy. It changes every 3 months which is one trimester. 

  • In the First trimester, the Normal TSH range of a pregnant lady is 0.3‑4.5 mIU/L.
  • In the Second trimester, when a pregnant lady goes for TSH thyroid test the TSH range is 0.3‑4.6 mIU/L. 
  • Whereas when the Third trimester approaches the TSH levels to shift in the range of 0.8‑5.2 mIU/L.

High TSH Range 

  • If the TSH level peaks the normal lab values and reaches an abnormal TSH level then it is said to be high TSH levels.
  • Hypothyroidism is diagnosed with TSH levels high.

[ALSO CHECK] Total Information on High TSH Levels

Low TSH Levels

  • When the TSH low below the lower end of the TSH range, we call it Low TSH levels.
  • The thyroid problem which is diagnosed with the low TSH is known as Hyperthyroidism and it is the what low TSH levels means

Note: The normal TSH range levels are the same throughout the world according to the normal lab values.

What does it matter if we know the TSH range or not? It is because when you undergo a thyroid test TSH and waiting for the thyroid test results, you would know the importance of thyroid test ranges or TSH ranges. This helps in knowing the normal TSH ranges beforehand and also the underactive thyroid test levels we can recognize, once the at home thyroid test results are out. To know further about this thyroid diagnosis and thyroid problems check My Thyroid Problems


Word Meaning
TSH Thyroid Stimulating Hormone
Triiodothyronine T3 hormone produced by the Thyroid gland
Hypothyroidism Thyroid gland cant produce enough Thyroid hormones
Thyroid Hormones T3, T4, and Calcitonin
mIU/L milli-international units per liter
T4 Thyroxine

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