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TriIodothyronine Free

200
4.1
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Overview
Interpretations
FAQ's
TriIodothyronine Free

Overview of TriIodothyronine Free

What is TriIodothyronine Free?

Triiodothyronine (T3) is a hormone secreted by the thyroid gland (small, butterfly-shaped gland located in front of the neck). The T3 hormone is essential for growth and metabolism. T3 circulates in the blood in two forms: Free form (FT3) and Bound form. Free Triiodothyronine (T3) Test measures the Free form of the T3 hormone.

Sample Type

The sample type collected for TriIodothyronine Free is: Blood

Preparation for TriIodothyronine Free

  • Do not eat or drink anything other than water for 8-12 hours before the test.

Why Get Tested for TriIodothyronine Free?


  • To diagnose thyroid diseases (Hypothyroidism or Hyperthyroidism)

  • To monitor treatment in patients with thyroid diseases

  • To evaluate thyroid status in patients with altered distribution of thyroid binding proteins (e.g. pregnancy, dysalbuminemia)








Understand more about TriIodothyronine Free

There is a feedback system in the body to maintain stable amounts of the thyroid hormones (T3 and T4) in the blood. When thyroid hormone levels decrease, the pituitary gland is stimulated to release TSH. This high TSH in turn leads to release of more thyroid hormones (T3 & T4) from the thyroid gland and vice-versa.



T3 hormone circulates in the blood in two forms:

1) Bound form - It is bound to proteins present in blood and this prevents it from entering body tissues.

2) Free form - It enters the body tissues where it's needed and thus is the active form.

 

The total T3 includes both bound and free forms circulating in blood and can be affected by the amount of protein available in the blood to bind to them.

Majority of the T3 hormone is formed from T4 hormone and a smaller fraction is produced directly by the thyroid gland. Free Triiodothyronine (FT3) constitutes only 0.3% of the total T3 hormone. The two main proteins in blood that the T3 hormone is bound to are albumin and Thyroxine-binding globulin (TBG), also called Thyroid hormone Binding Globulin (THBG).

 

Hence, T3 hormone can be measured as Free T3 or Total T3. Free Triiodothyronine (T3) Test is also done as a part of Thyroid profile Free test which includes two more tests : Thyroid Stimulating Hormone (TSH) and Free Thyroxine (FT4).

The thyroid gland secretes the following hormones:

  • Triiodothyronine (T3)

  • Thyroxine (T4)

  • Calcitonin


Thyroid Stimulating Hormone (TSH), also called Thyrotropin is a hormone secreted into the blood by a gland present in the brain (Pituitary gland) and it tells your thyroid gland to make and release the thyroid hormones (T3 & T4) into your blood. The thyroid gland uses iodine from food to make the thyroid hormones.


The thyroid hormones are essential for growth and metabolism. If the thyroid gland produces very high amounts of these hormones (T3 and T4), you may experience symptoms of weight loss, rapid heartbeat, tremors, sweating, anxiety, increased sensitivity to heat etc. and this is known as Hyperthyroidism.

Also, the decreased production of thyroid hormones (T3 and T4) results in Hypothyroidism which may cause symptoms like weight gain, fatigue, slow heart rate, increased sensitivity to cold, depression, dry and thin hair etc.

There is a feedback system in the body to maintain stable amounts of the thyroid hormones (T3 and T4) in the blood. When thyroid hormone levels decrease, the pituitary gland is stimulated to release TSH. This high TSH in turn leads to release of more thyroid hormones (T3 & T4) from the thyroid gland and vice-versa.



T3 hormone circulates in the blood in two forms:

1) Bound form - It is bound to proteins present in blood and this prevents it from entering body tissues.

2) Free form - It enters the body tissues where it's needed and thus is the active form.

 

The total T3 includes both bound and free forms circulating in blood and can be affected by the amount of protein available in the blood to bind to them.

Majority of the T3 hormone is formed from T4 hormone and a smaller fraction is produced directly by the thyroid gland. Free Triiodothyronine (FT3) constitutes only 0.3% of the total T3 hormone. The two main proteins in blood that the T3 hormone is bound to are albumin and Thyroxine-binding globulin (TBG), also called Thyroid hormone Binding Globulin (THBG).

 

Hence, T3 hormone can be measured as Free T3 or Total T3. Free Triiodothyronine (T3) Test is also done as a part of Thyroid profile Free test which includes two more tests : Thyroid Stimulating Hormone (TSH) and Free Thyroxine (FT4).



What Results of TriIodothyronine Free mean?

Interpretations

The results show either excessively high or low levels of free T3 in the blood samples. The normal range for free T3 is from 1.8 to 5.4 mcg/dl for men and women of all age groups.



Patient Concerns about TriIodothyronine Free

Frequently Asked Questions about TriIodothyronine Free

Q. What is Hyperthyroidism?
Hyperthyroidism is a condition in which the thyroid gland is overactive and there is an increased production of thyroid hormones by the thyroid gland. Causes of Hyperthyroidism include Graves’ disease, multinodular goiter, thyroid nodules, toxic adenoma, inflammation of the thyroid, eating too much iodine, and too much synthetic thyroid hormone. Diagnosis of this condition can help to relieve the symptoms and prevent long term complications.
Q. What are the symptoms of Hyperthyroidism?
Symptoms of Hyperthyroidism include: Rapid heartbeat (tachycardia) — commonly more than 100 beats/minute — irregular heartbeat (arrhythmia) or pounding of your heart (palpitations), sudden weight loss, nervousness, anxiety, irritability, tremor (usually a fine trembling in your hands and fingers), changes in menstrual patterns, increased sensitivity to heat, changes in bowel patterns (especially more frequent bowel movements), an enlarged thyroid gland (goiter) which may appear as a swelling at the base of your neck, increased appetite, sweating, fatigue, muscle weakness, sleep disturbances, skin thinning, fine and brittle hair
+ more

Provided By

NABL

ISO

Clinitech Laboratory Private Limited was registered at Registrar of Companies Mumbai on 19 March, 2010 and is categorised as Company limited by Shares and an Non-govt company. Clinitech Laboratory Private Limited's Corporate Identification Number (CIN) is U85195MH2010PTC201078 and Registeration Number is 201078. Clinitech Laboratory Private Limited registered address on file is AL - 1 / 545 & 546, SECTOR 16, AIROLI, NAVI MUMBAI MH 400708 IN, Navi Mumbai - 400708, Maharashtra, India. Clinitech Laboratory Private Limited currently have 2 Active Directors / Partners: Jagdish Umakant Nayak, Jyoti Jagdish Nayak, and there are no other Active Directors / Partners in the company except these 2 officials. Clinitech Laboratory Private Limited is involved in Community, Personal & Social Services Activity

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