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Why is Thyroid Test (TSH, Free T4, Total T3) primary?

Updated: Apr 24

Description on the importance of thyroid test to screen the thyroid related disease

What is Thyroid?

The thyroid gland is an endocrine organ which covers the thyroid cartilage. This small body tissue regulates various vital body functions.

What is Thyroid function test?

The thyroid function test is a test to check the functionality of the thyroid to speculate the medical reason of the abnormal health state. A health professionals will may see the hormonal state of thyroid levels.

Who is in the high risk of thyroid disease?

American cancer society announced that women has a risk of 3 times more of getting thyroid cancer than men. Women in the age of 40s or 50s and the men in the age of 60s or 70s may develop a thyroid disorder during their lifetime.

What can you find from the thyroid tests?

The clinical judgement should not be established on a single test, but should be determined in conjuction with the cooperation of thealth professionals.


Normal Reference Range




(Thyroid Stimulating Hormone)

0.49 - 3.82 mIU/L

Pituitary hormone which stimulates the thyroid gland

Hyperthyroidism or Hypothyroidism

Free T4

0.83 - 1.60 ng/dL

​Primarily responsible for regulation of metabolism

​Hyperthyroidism or Hypothyroidism

Total T3


More accurate indicator for diagnosing hyperthyroidism


Please note that the Normal Reference Range is for reference only, and that criteria may be applied differently by each institution.


1. Lab test online (TSH)

2. Lab test online (Thyroid Disease)

3. American Cancer Society - Thyroid Cancer Risk Factors

4. NanoEntek FREND Hompage (TSH)

5. NanoEntek FREND Hompage (Thyroid Duo)

6. NanoEntek FREND Hompage (Free T4)

7. NanoEntek FREND Hompage (Total T3)

[FREND System]

Rapid quantitative immunoassay analyzer

FREND is a quantitative immunoassay analyzing instrument that utilizes disposable cartridge to provide in vitro diagnostics results.

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