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Book Thyroxine (T4) 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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What is Thyroxine (T4) test?

Insufficient production of thyroid hormones T3 &T4 is known as hypothyroidism and overproduction is termed as hyperthyroidism or thyrotoxicosis. Estimation of Serum TSH along with T3 &T4 is useful for differentiating the thyroid disorders of hypothalamic or pituitary origin from those of thyroid origin. In hypothyroidism of thyroid origin (primary hypothyroidism), the TSH level is elevated but in secondary hypothyroidism (of pituitary or hypothalamic origin) the TSH level is low.

Why get the Thyroxine (T4) test?

Estimation of T4 (thyroxine) and T3 (triiodothyronine) is used to check for thyroid diseases. Both are decreased in hypothyroidism but are increased in hyperthyroidism. When the results of T4 and T3 are borderline and conflicting free hormone levels FT3 & FT4 are estimated.

When to take this test?


Body Part

Thyroid gland

Sample Requirement


Normal Range

4.5 - 10.9
Hyperthyroid : 11 - 19.1
Hypothyroid : 0.0 - 5.5
Sick Euthyroid: 1.9 - 13.3
Pregnant Euthyroid: 6.4 - 10.7 mcg/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.