Thyroid Profile 2

FT3 FT4 TSH Test

FT3, FT4 TSH – Triiodothyronine (T3) normally represents only approximately 5% of the thyroid hormone and like thyroxine is almost entirely bound to the carrier proteins, with only 0.25% of the total being in the free state. Measurement of free triiodothyronine is of value in confirming the diagnosis of hyperthyroidism, when an elevated free or total thyroxine level is found. Abnormal total and free triiodothyronine concentrations may appear in T3 toxicosis, in the presence of normal thyroxine levels. Free T3 levels are unaffected by carrier protein variation. – Free thyroxine (FT4) comprises a small fraction of total thyroxine. The FT4 is available to the tissues and is, therefore, the metabolically active fraction. Elevations in FT4 cause hyperthyroidism, while decreases cause hypothyroidism.

Free T3, Free T4, TSH

1. Free T3 Test
2. Free T4 Test
3. Thyroid Stimulating Hormone (TSH) Test

Note:

• Overnight fasting is not required
• In some cases, the doctor may advice 10 to 12 Hours fasting before the sample collection
• Doctor’s prescription may be needed
• The test result may vary depending on gender, age, health history, etc.

Also known as, Free T3 and Free T4 Blood, Free T3 and Free T4, ft3 ft4 tsh, ft3 ft4

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