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New England · Free T4 Levels Test – Thyroid Testing (FT4)

Free T4 Levels Test – Thyroid Testing (FT4) in New Hampshire

Free T4 Levels Test – Thyroid Testing (FT4) can be ordered without a referral, and this guide covers what to expect. This test measures the amount of free thyroxine (T4) in your blood to help assess thyroid function.

Typical turnaround1-3 business days
Price range$39
PreparationFollow the lab's instructions.
Sample typeBlood draw at a collection lab
ReferralNo referral required

What this test is

Free thyroxine (FT4) is a hormone produced by the thyroid gland that plays a crucial role in metabolism. This test specifically measures the unbound form of thyroxine, which is the biologically active portion available for your body's tissues to use.

What it measures

  • Free Thyroxine (FT4) — reflects the amount of active thyroid hormone available for use by the body

What the test involves

This test requires a blood sample, which is typically collected from a vein in your arm. A healthcare professional will draw the blood and place it in a collection tube.

Why it is often ordered

Clinicians often order this test to help evaluate thyroid conditions, such as an overactive thyroid (hyperthyroidism) or an underactive thyroid (hypothyroidism). It can also be used to monitor thyroid treatment.

Preparation

Follow any specific instructions provided by the laboratory before your blood draw. Some labs may ask you to fast or avoid certain medications.

How results are reported

Your results will indicate the level of free thyroxine detected in your blood sample. Reference ranges, which define what is considered typical, vary between laboratories and should be discussed with your healthcare provider.

Before you go

  • Fasting requirements
  • Medication restrictions
  • Specific preparation instructions

Cities

Free T4 Levels Test – Thyroid Testing (FT4) in New Hampshire communities

Choose your city for local context and to request this test.

Nashua235,982Free T4 Levels Test – Thyroid Testing (FT4)Manchester167,568Free T4 Levels Test – Thyroid Testing (FT4)Portsmouth97,455Free T4 Levels Test – Thyroid Testing (FT4)Dover89,874Free T4 Levels Test – Thyroid Testing (FT4)Concord43,552Free T4 Levels Test – Thyroid Testing (FT4)Rochester32,317Free T4 Levels Test – Thyroid Testing (FT4)Keene22,969Free T4 Levels Test – Thyroid Testing (FT4)Laconia16,786Free T4 Levels Test – Thyroid Testing (FT4)Lebanon14,316Free T4 Levels Test – Thyroid Testing (FT4)Claremont12,955Free T4 Levels Test – Thyroid Testing (FT4)Somersworth11,964Free T4 Levels Test – Thyroid Testing (FT4)Berlin9,710Free T4 Levels Test – Thyroid Testing (FT4)Franklin8,766Free T4 Levels Test – Thyroid Testing (FT4)South Hooksett5,906Free T4 Levels Test – Thyroid Testing (FT4)Suncook5,008Free T4 Levels Test – Thyroid Testing (FT4)Pinardville4,849Free T4 Levels Test – Thyroid Testing (FT4)East Merrimack4,609Free T4 Levels Test – Thyroid Testing (FT4)Tilton Northfield2,868Free T4 Levels Test – Thyroid Testing (FT4)Hampton Beach2,480Free T4 Levels Test – Thyroid Testing (FT4)North Conway2,393Free T4 Levels Test – Thyroid Testing (FT4)Woodsville1,418Free T4 Levels Test – Thyroid Testing (FT4)West Swanzey1,339Free T4 Levels Test – Thyroid Testing (FT4)Contoocook1,218Free T4 Levels Test – Thyroid Testing (FT4)North Haverhill1,097Free T4 Levels Test – Thyroid Testing (FT4)