Free T4 (FT4) in Dehradun
Also known as: Free T4, FT4, Free Thyroxine, Free T4 test, FT4 blood test, Thyroid hormone test
- Sample
- Blood
- Fasting
- Not required
- Report
- 24-72 hours
- Processed
- NABL partner lab
LabONE price
₹300
- Free home collection on ₹999+ (₹199 visit fee below that)
- Pathologist-reviewed report on WhatsApp
- MIRA Smart Report in plain language
100%
reports reviewed by a pathologist
5.0★
five-star rated on Google
77
biomarkers in the ₹999 full body
Same day
reports on WhatsApp, or by next morning
What is a Free T4 (FT4)?
Thyroxine, or T4, is the main hormone the thyroid gland releases, and it sets the pace of metabolism in nearly every tissue in the body. Almost all of it travels through the blood bound to carrier proteins, and while bound it is inert. Only the small unbound fraction, Free T4, can enter cells and act. Measuring the free portion therefore reflects what the thyroid is actually delivering, whereas a total T4 rises and falls with carrier-protein levels and can mislead. This distinction matters more than it sounds. Pregnancy, the contraceptive pill, oestrogen therapy, liver disease and serious illness all shift carrier proteins substantially, so a total T4 can look abnormal while thyroid function is entirely normal. Free T4 is interpreted alongside TSH, the pituitary signal that tells the thyroid how hard to work. The two together locate the problem: a high TSH with a low Free T4 indicates an underactive thyroid, while a low TSH with a high Free T4 indicates an overactive one.
Why take this test?
Free T4 is advised whenever a TSH result comes back abnormal, to confirm the finding and grade how severe it is. It is also indicated where symptoms point to the thyroid: unexplained tiredness, weight gain or loss without a change in diet, hair fall, dry skin, feeling cold or unusually hot, constipation, palpitations, tremor, anxiety, low mood, irregular periods or difficulty conceiving. It is a standard part of thyroid assessment in pregnancy, where untreated hypothyroidism carries real risk to both mother and baby, and where Free T4 is the more dependable measure. It is used to monitor treatment, both to check that a thyroxine dose is right and to follow anti-thyroid medicines. Thyroid disorders are notably common across the sub-Himalayan belt that includes Uttarakhand, and they affect women several times more often than men, so vague symptoms in this region are worth testing rather than dismissing.
- Fatigue, weight change, hair fall, or palpitations
- An abnormal TSH result
- Pregnancy thyroid assessment
- Monitoring a thyroxine dose
- Feeling unusually cold or unusually hot, or dry skin
- Irregular periods or difficulty conceiving
Normal reference ranges
| Biomarker | Healthy reference range |
|---|---|
| Free T4 (FT4) | 0.8 - 1.8 ng/dL |
Ranges are indicative for adults. Your report carries the lab-specific reference range and is reviewed by a LabONE pathologist; always interpret results with your doctor.
Related tests
Other Endocrinology tests booked with home collection in Dehradun.
FAQs: Free T4 (FT4) in Dehradun
How much does a Free T4 (FT4) cost in Dehradun?
A Free T4 (FT4) at LabONE in Dehradun costs ₹300. Home sample collection is free on any booking of ₹999 or more (a ₹199 visit fee applies below that). Every report is pathologist-reviewed and delivered on WhatsApp with the MIRA Smart Report explaining it in plain language.
What is the difference between Free T4 and Total T4?
Total T4 includes hormone bound to proteins; Free T4 measures only the active, unbound part, which is more reliable in pregnancy and certain illnesses.
Is fasting required for a Free T4 test?
No, fasting is not required.
Should I test Free T4 or TSH first?
TSH is the usual first test, because the pituitary reacts to small thyroid changes and so TSH shifts earliest. Free T4 is added when TSH is abnormal, when symptoms are strong despite a normal TSH, in pregnancy, and where a pituitary problem is suspected, since in that situation TSH alone can be misleading.
When should I take my thyroxine tablet on the day of the test?
Take the sample before your morning dose, then take the tablet afterwards. A dose taken shortly before the draw can raise the Free T4 reading and make a correct dose look excessive. Tell the phlebotomist when you last took it, and keep your timing consistent between tests so results stay comparable.
Can Free T4 be normal when I still feel unwell?
Yes. Early or mild thyroid disease often shows a raised TSH while Free T4 is still within range, a pattern called subclinical hypothyroidism. Symptoms can also come from anaemia, low vitamin B12 or vitamin D, or another cause entirely, which is why a normal Free T4 should prompt a wider look rather than the end of the enquiry.
How do I book a Free T4 (FT4) in Dehradun?
Message LabONE on WhatsApp, pick a slot, and a trained phlebotomist collects your sample at home. Home collection is free on any order of ₹999 or more, otherwise a ₹199 visit fee applies.
Is home sample collection available for the Free T4 (FT4)?
Yes. LabONE collects your sample at home across Dehradun with a single, careful prick. Morning slots (6-10 AM) are reserved for fasting tests.
How will I get my Free T4 (FT4) report?
Your pathologist-reviewed report arrives on WhatsApp via MIRA, with the MIRA Smart Report explaining what it means in plain language.
Free T4 (FT4) at home across Dehradun
LabONE offers home sample collection for the Free T4 (FT4) across Dehradun, including Rajpur Road, Race Course, Clock Tower, Paltan Bazaar, Astley Hall, Dalanwala, Karanpur, Patel Nagar, Ballupur, GMS Road, Sahastradhara Road, Vasant Vihar, Nehru Colony, Subhash Nagar, Prem Nagar, Clement Town, Jakhan, Dilaram Bazaar, EC Road, Kanwali, Niranjanpur, Mussoorie Road, and nearby areas.
How home collection works
From a WhatsApp message to a report you actually understand, in four steps.
- 1
Book on WhatsApp
Tell MIRA which test you want, or ask what to check.
- 2
Free home collection
A trained phlebotomist visits you. Free on any ₹999+ booking.
- 3
Tested at our lab
Processed and reviewed by a LabONE pathologist.
- 4
Report, explained
On WhatsApp via MIRA, with the MIRA Smart Report in plain language.
Book your Free T4 (FT4) in Dehradun
₹300, free home collection on ₹999+ carts. Reports on WhatsApp with the free MIRA Smart Report.
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