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Triiodothyronine (T3) Is a thyroid hormone, most of which circulates in a state bound to proteins - thyroxine-binding globulin and albumin.
About 3% of circulating triiodothyronine (T80) is produced by peripheral transformation of thyroxine (T4), while the remaining 20% is produced by the thyroid gland itself.
It represents only 0,3% of the total amount of triiodothyronine in the blood Free triiodothyronine (FT3), which provides the entire range of metabolic activity. FT3 is almost 5 times more active than FT4. It increases heat production and oxygen consumption in all body tissues except brain tissue, spleen and testes; stimulates the synthesis of vitamin A in the liver; reduces the concentration of cholesterol and triglycerides in the blood; accelerates protein metabolism; increases the excretion of calcium in the urine; activates bone metabolism, but more - bone resorption; It has a positive chrono- and inotropic effect on the heart; Stimulates reticular formation and cortical processes in the central nervous system. The concentration of T3 depends on the concentration of TSH (thyreotropic hormone), so its determination is informative to assess the status of the thyroid gland when the level of TSH changes.
In thyrotoxicosis, as a rule, the concentration of T4 and T3 (total and free) in the blood is increased, but in a small number of patients with T3-toxicosis, only the level of T3 is increased. This is usually associated with iodine deficiency, when TSH levels can be suppressed by isolated hyperproduction of T3 with unchanged T4 concentrations.
Serum T3 and FT3 concentrations are substantially dependent on the T4 → T3 peripheral conversion rate. The conversion speed can be reduced:
The test should be performed on an empty stomach.
Venous blood
Concentration of FT3 increases:
FT3 concentration decreases:
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More than 1000 routine and complex/specific diagnostic tests in all major areas of clinical pathology.
53 laboratory centers in 25 cities of Georgia: Tbilisi, Rustavi, Kutaisi, Batumi, Marneuli, Telavi, Zugdidi, Zestafon, Gori, Kobuleti, Akhaltsikhe, Khashuri, Sartichala, Kazbegi, Borjomi, Samtredia, Gurjaani, Lagodekhi, Akhmeta, Ozurgeti, Poti, Chiatura , Kabali village, Dusheti, Kareli, Tianeti.
Use the Synevo web platform to view results from anywhere and anytime
Use the Synevo web platform to view results from anywhere, anytime
From Monday to Saturday you can use the laboratory services at home.
☎️ Hotline: 239 38 33 or 239 40 65
577293008 (9:00-დან 17:00-მდე)
30 laboratory centers in 11 cities of Georgia: Tbilisi, Kutaisi, Batumi, Kobuleti, Zugdidi, Zestaponi, Rustavi, Marneuli, Akhaltsikhe, Telavi, Gori.
More than 3000 routine and complex / specific diagnostic tests in all major areas of clinical pathology.
"Synevo" - Providing a wide range of diagnostic services in Georgia, offering more than 1,000 routine and specific diagnostic tests in all major areas of clinical pathology. By the end of 2024, the Synevo Georgia network will include 3 clinical laboratories and 53 blood sampling units, which will perform more than 300,000 tests.
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