FT3 (free T3)

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600,00 rsd

Obrtno Vreme

4h

Uzorkovanje

Drawing blood

Kategorija

Immunohemistry

When it comes to maintaining optimal health, it is crucial to understand the vital health indicators of our body. One such indicator is the level of FT3, also known as free triiodothyronine, in our bloodstream. At IntroLab laboratory in Belgrade, our team of experts is dedicated to providing precise analyses like the FT3 (free T3) test, helping you better understand and manage your health.

What is FT3 (free T3)?

Free T3 (FT3) is one of the two primary hormones produced by the thyroid gland, the other being thyroxine (T4). Most of the T3 in the body is created through the conversion of T4 to T3, a process that occurs in various parts of the body, including the liver and kidneys. Triiodothyronine, or T3, is a biologically active hormone that plays a central role in regulating various functions in the body.

Active form of the hormone

Although a small amount of T3 is produced directly in the thyroid gland, most (about 80%) of the T3 in the body is formed by the conversion of T4, another thyroid gland hormone, in the periphery – in parts of the body outside the thyroid gland such as the liver and kidneys. Since T3 is the active form of the hormone, its level can be crucial for understanding the functioning of the thyroid gland.

Free vs. bound hormone

The term “free” in the context of free T3 refers to the fact that this hormone is not bound to proteins in the blood. While most thyroid hormones in the blood are bound to proteins, meaning they are not available for interaction with cells, free T3 is unbound and can freely travel to cells where it exerts its effects. This makes it an important indicator for people with certain thyroid conditions, as it indicates the amount of active hormone available to the body.

Variations in FT3 levels

FT3 levels can vary depending on the time of day. They are usually highest in the morning and lowest in the afternoon and evening. This can be important for people undergoing FT3 (free T3) analysis, as they should consider the time of day when testing.

Impact of other factors on FT3 levels

It’s important to know that FT3 levels can also be elevated in situations not directly related to the thyroid gland. For example, pregnancy, the use of certain medications, and certain liver diseases can affect FT3 levels. Therefore, it is advisable to discuss with your doctor any factors that might affect the results before analysis.

When is the FT3 (free T3) analysis conducted?

The FT3 test is a precise indicator of thyroid gland function, independent of changes in concentrations and binding capabilities of binding proteins. The test is used when thyroid disorders are suspected, including hyperthyroidism and hypothyroidism, providing crucial information for the differential diagnosis of these conditions. Also, the FT3 test is key in identifying T3 thyrotoxicosis, a condition characterized by an excessive level of T3 hormone in the blood. This test not only helps in diagnosis but also in monitoring the effectiveness of therapy, allowing for adjustment of the treatment plan according to the patient’s needs.

What do the results of the FT3 (free T3) analysis mean?

The results of the FT3 analysis can be normal, elevated, or decreased.

  • Normal FT3 levels vary but typically range from 2.0 to 4.4 pg/ml.
  • Elevated FT3 levels may indicate hyperthyroidism, a condition in which the thyroid gland produces too much hormone. Symptoms of hyperthyroidism include rapid heart rate, nervousness, weight loss, and heat intolerance.
  • Decreased FT3 levels may indicate hypothyroidism, a condition in which the thyroid gland does not produce enough hormone. Symptoms of hypothyroidism include fatigue, weight gain, dry skin, and cold intolerance.

Variations in tests

It is important to note that FT3 test results can vary depending on the laboratory and the methods they use. Tests from different manufacturers can yield different results due to differences in methods and test specificities. For this reason, it is best to monitor FT3 values using the same method, i.e., in the same laboratory, to ensure consistency of results.

Vrsta uzorka i vreme kada se uzima uzorak

Uzorak: Serum (venous blood)

Obrtno vreme: 4h

Priprema: Preparation for the FT3 test may depend on the therapy you are using. If you are taking thyroid hormones, blood samples are usually taken before the next dose. If you are not on therapy, no special preparation is needed, although it is not recommended to sample immediately after a meal. If you are suffering from an acute illness, testing may be postponed until you recover. Consult with your doctor about the timing of the testing.

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