Thyroxine - Free (FT4) - Serum

Thyroxine - Free (FT4) - Serum


This test is used to help evaluate thyroid function and diagnose thyroid diseases, including hyperthyroidism and hypothyroidism

This Test Includes

Thyroxine - Free (FT4) - Serum

Test Instructions

Total parameters available: 1

Parameter Names:

  • Thyroxine - Free (FT4) - Serum

Test Instructions/Precautions:

  • Alcohol: Please abstain from alcohol before the test
  • Medication :Any pre-existing medication should only be stopped after consultation with the referring Physician


Soft Copy (Portal/Email) : If the sample is collected before 12 noon then the report will get delivered as per Reporting Time / Maximum TAT (Turn Around Time) indicated with the test. For samples collected after 12 Noon, 12 hours may be added to the Report Turn Around TimeHard Copy : Delivered at home upon request. A small convenience fee may apply.

Why it is Done

This test is done for
It is highly recommended for people over the age of 60 and pregnant women to help in early detection and treatment of thyroid disorders. It is useful to screen when you experience any of the following symptoms:
Weight gain/weight loss
Cold/heat intolerance
Menstrual irregularity in women
Puffiness around the eyes
Tremors in the hands
Hair loss
Monitoring: This test not only helps to monitor thyroid hormone levels but also to understand the severity of disease and delay or prevent complications such as heart problems, mental illness, metabolic disorders, infertility and birth defects in new-borns.
Management: Doing this test regularly helps to check the effectiveness of treatment and helps the doctor to change the treatment plan accordingly.

What is this test

Thyroxine - Free (FT4) - Serum test measures the hormone free thyroxine in blood. it is the unbound fraction of the hormone T4 in blood. Levels of T4 may increase or decrease in various diseases of thyroid gland. It is done to diagnose and monitor conditions like Hypothyroidism, Hyperthyroidism etc