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

Free T4 Levels Test – Thyroid Testing (FT4) in Massachusetts

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 Massachusetts communities

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

Boston4,208,580Free T4 Levels Test – Thyroid Testing (FT4)Springfield620,494Free T4 Levels Test – Thyroid Testing (FT4)Worcester573,573Free T4 Levels Test – Thyroid Testing (FT4)New Bedford158,353Free T4 Levels Test – Thyroid Testing (FT4)Leominster118,190Free T4 Levels Test – Thyroid Testing (FT4)Cambridge116,892Free T4 Levels Test – Thyroid Testing (FT4)Lowell114,804Free T4 Levels Test – Thyroid Testing (FT4)Brockton104,216Free T4 Levels Test – Thyroid Testing (FT4)Quincy100,544Free T4 Levels Test – Thyroid Testing (FT4)Lynn100,233Free T4 Levels Test – Thyroid Testing (FT4)Fall River93,339Free T4 Levels Test – Thyroid Testing (FT4)Newton88,647Free T4 Levels Test – Thyroid Testing (FT4)Lawrence87,798Free T4 Levels Test – Thyroid Testing (FT4)Somerville80,608Free T4 Levels Test – Thyroid Testing (FT4)Framingham72,089Free T4 Levels Test – Thyroid Testing (FT4)Haverhill67,093Free T4 Levels Test – Thyroid Testing (FT4)Malden65,602Free T4 Levels Test – Thyroid Testing (FT4)Waltham64,655Free T4 Levels Test – Thyroid Testing (FT4)Revere60,720Free T4 Levels Test – Thyroid Testing (FT4)Medford60,708Free T4 Levels Test – Thyroid Testing (FT4)Taunton59,076Free T4 Levels Test – Thyroid Testing (FT4)Chicopee55,636Free T4 Levels Test – Thyroid Testing (FT4)Peabody54,200Free T4 Levels Test – Thyroid Testing (FT4)Methuen Town52,536Free T4 Levels Test – Thyroid Testing (FT4)Everett48,368Free T4 Levels Test – Thyroid Testing (FT4)Attleboro46,146Free T4 Levels Test – Thyroid Testing (FT4)Salem44,452Free T4 Levels Test – Thyroid Testing (FT4)Pittsfield43,890Free T4 Levels Test – Thyroid Testing (FT4)Beverly42,448Free T4 Levels Test – Thyroid Testing (FT4)Fitchburg41,796Free T4 Levels Test – Thyroid Testing (FT4)Marlborough41,505Free T4 Levels Test – Thyroid Testing (FT4)Woburn40,967Free T4 Levels Test – Thyroid Testing (FT4)Westfield40,922Free T4 Levels Test – Thyroid Testing (FT4)Chelsea40,025Free T4 Levels Test – Thyroid Testing (FT4)Holyoke38,480Free T4 Levels Test – Thyroid Testing (FT4)Watertown Town35,171Free T4 Levels Test – Thyroid Testing (FT4)Gloucester29,814Free T4 Levels Test – Thyroid Testing (FT4)Melrose29,567Free T4 Levels Test – Thyroid Testing (FT4)Northampton29,379Free T4 Levels Test – Thyroid Testing (FT4)Gardner21,183Free T4 Levels Test – Thyroid Testing (FT4)Newburyport18,282Free T4 Levels Test – Thyroid Testing (FT4)North Adams13,024Free T4 Levels Test – Thyroid Testing (FT4)South Yarmouth11,696Free T4 Levels Test – Thyroid Testing (FT4)Middleborough Center7,790Free T4 Levels Test – Thyroid Testing (FT4)Mansfield Center7,689Free T4 Levels Test – Thyroid Testing (FT4)Whitinsville7,329Free T4 Levels Test – Thyroid Testing (FT4)West Concord7,003Free T4 Levels Test – Thyroid Testing (FT4)Cochituate6,966Free T4 Levels Test – Thyroid Testing (FT4)East Falmouth6,739Free T4 Levels Test – Thyroid Testing (FT4)Pinehurst6,653Free T4 Levels Test – Thyroid Testing (FT4)West Yarmouth6,124Free T4 Levels Test – Thyroid Testing (FT4)Yarmouth Port5,872Free T4 Levels Test – Thyroid Testing (FT4)Bliss Corner5,529Free T4 Levels Test – Thyroid Testing (FT4)North Scituate5,519Free T4 Levels Test – Thyroid Testing (FT4)East Harwich5,519Free T4 Levels Test – Thyroid Testing (FT4)Raynham Center5,072Free T4 Levels Test – Thyroid Testing (FT4)Smith Mills4,846Free T4 Levels Test – Thyroid Testing (FT4)North Westport4,835Free T4 Levels Test – Thyroid Testing (FT4)The Pinehills4,724Free T4 Levels Test – Thyroid Testing (FT4)Millis-Clicquot4,653Free T4 Levels Test – Thyroid Testing (FT4)