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Book T4 Free (FT4) Test Online

Conveniently book for a home collection and get your reports online.

60 min Home collection

As per NABL testing standards

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Connected to your doctor

What is T4 Free (FT4) test?

The unbound or free thyroxine hormone FT4 is the active fraction that is readily available for uptake into cells whereas the bound hormone, T4 on the other hand, represents a circulating storage pool that is not immediately available for uptake into cells.

Why get the T4 Free (FT4) test?

Free T4 helps in determining thyroid dysfunction in patients with symptoms of hypothyroidism or hyperthyroidism with normal TSH values. Free T4 measurements can be useful to determine appropriate dose increases or decreases in those taking medication for thyroid disorders when TSH is very high or low. FT4 and T3 are usually elevated with low TSH in hyperthyroidism.

When to take this test?


Body Part

Thyroid gland

Sample Requirement


Normal Range

0.89 ng/dL to 1.76 ng/dL

Frequency to repeat test

Every 6 months

Precautions to be taken before for the test

No particular precautions are required, unless it is recommended by your doctor.


Doctor and Patient
Test is available in Bangalore through Orange Health Diagnostic Lab.
Order now & get your sample collected in 60 minutes


What our customers say about us


 I normally have an issue with my veins as they are very thin but the technician was experienced and the sample came out in one shot at the first attempt, which really reassured me.

Arshia L.


The pickup was done extremely nicely. Got a message when the person started , no calls for directions and most of all extremely polite representative.

Nishanth I.


Got my one year old tested. Very professional and safe. Using sealed sample kits with needles, tubes and gloves pre-packed.

Pallavi T.