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Special Instruction : No fasting required
Parameters covered : 1
Sample(s) required : Serum, Serum (3 ml)
₹250 ₹350
Home Collection
Lab Visit

Parameters (1)

Overview

Thyroxine Free (FT4)

Thyroxine Free (FT4)


Measure your Free T4 levels! This key thyroid function test measures the unbound, biologically active form of Thyroxine circulating in your blood. Free T4 directly indicates how much hormone is available to regulate your entire metabolism, energy, and body temperature. It is the most reliable marker for assessing your true thyroid status because it isn't affected by carrier protein changes (like those caused by pregnancy or estrogen). Essential for accurately diagnosing and monitoring hypothyroidism (low Free T4) and hyperthyroidism (high Free T4), and optimizing hormone replacement therapy. Check your Free T4 for a precise view of your endocrine health!

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Pre-test Information
No fasting required
Report Delivery
Same Day
Code
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Usage
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Category
Sample Report Download
Not Available
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Frequently asked questions on " Thyroxine Free (FT4) "

Free T4 is the active, unbound portion of the Thyroxine hormone. Since it's not attached to carrier proteins, it accurately reflects the amount of hormone available to enter your cells and influence your metabolism. It avoids interference from protein changes, unlike the less accurate Total T4 test.

Free T4 acts as the essential precursor for Free T3 (the most active thyroid hormone). Its availability directly controls the amount of active hormone the body can produce to regulate energy levels, body weight, and heart rate.

Overnight fasting is preferred.

Thyroxine – Free (FT4) reports are available over email or WhatsApp within 4-8 hours after the blood sample collection.

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