STD Booking Find and request a lab test

Pacific · Free T4 Levels Test – Thyroid Testing (FT4)

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

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 Washington communities

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

Seattle3,438,221Free T4 Levels Test – Thyroid Testing (FT4)Spokane440,270Free T4 Levels Test – Thyroid Testing (FT4)Kennewick241,230Free T4 Levels Test – Thyroid Testing (FT4)Bremerton219,538Free T4 Levels Test – Thyroid Testing (FT4)Tacoma217,332Free T4 Levels Test – Thyroid Testing (FT4)Olympia200,836Free T4 Levels Test – Thyroid Testing (FT4)Vancouver188,331Free T4 Levels Test – Thyroid Testing (FT4)Marysville164,655Free T4 Levels Test – Thyroid Testing (FT4)Bellevue149,365Free T4 Levels Test – Thyroid Testing (FT4)Kent134,890Free T4 Levels Test – Thyroid Testing (FT4)Yakima130,440Free T4 Levels Test – Thyroid Testing (FT4)Bellingham129,601Free T4 Levels Test – Thyroid Testing (FT4)Everett110,438Free T4 Levels Test – Thyroid Testing (FT4)Renton105,313Free T4 Levels Test – Thyroid Testing (FT4)Spokane Valley102,178Free T4 Levels Test – Thyroid Testing (FT4)Federal Way99,792Free T4 Levels Test – Thyroid Testing (FT4)Kirkland91,656Free T4 Levels Test – Thyroid Testing (FT4)Auburn85,306Free T4 Levels Test – Thyroid Testing (FT4)Pasco76,398Free T4 Levels Test – Thyroid Testing (FT4)Redmond72,166Free T4 Levels Test – Thyroid Testing (FT4)Wenatchee71,119Free T4 Levels Test – Thyroid Testing (FT4)Longview67,958Free T4 Levels Test – Thyroid Testing (FT4)Mount Vernon67,767Free T4 Levels Test – Thyroid Testing (FT4)South Hill66,713Free T4 Levels Test – Thyroid Testing (FT4)Sammamish66,532Free T4 Levels Test – Thyroid Testing (FT4)Lakewood62,972Free T4 Levels Test – Thyroid Testing (FT4)Richland59,718Free T4 Levels Test – Thyroid Testing (FT4)Shoreline58,213Free T4 Levels Test – Thyroid Testing (FT4)Lacey52,572Free T4 Levels Test – Thyroid Testing (FT4)Burien51,646Free T4 Levels Test – Thyroid Testing (FT4)Bothell47,355Free T4 Levels Test – Thyroid Testing (FT4)Edmonds42,622Free T4 Levels Test – Thyroid Testing (FT4)Puyallup42,366Free T4 Levels Test – Thyroid Testing (FT4)Issaquah39,057Free T4 Levels Test – Thyroid Testing (FT4)Lynnwood38,812Free T4 Levels Test – Thyroid Testing (FT4)Parkland38,092Free T4 Levels Test – Thyroid Testing (FT4)Lake Stevens35,135Free T4 Levels Test – Thyroid Testing (FT4)Spanaway34,670Free T4 Levels Test – Thyroid Testing (FT4)University Place34,565Free T4 Levels Test – Thyroid Testing (FT4)Walla Walla33,765Free T4 Levels Test – Thyroid Testing (FT4)Graham33,727Free T4 Levels Test – Thyroid Testing (FT4)Pullman32,968Free T4 Levels Test – Thyroid Testing (FT4)Des Moines32,631Free T4 Levels Test – Thyroid Testing (FT4)SeaTac30,867Free T4 Levels Test – Thyroid Testing (FT4)Orchards28,371Free T4 Levels Test – Thyroid Testing (FT4)Maple Valley27,643Free T4 Levels Test – Thyroid Testing (FT4)Camas25,774Free T4 Levels Test – Thyroid Testing (FT4)Mill Creek East25,528Free T4 Levels Test – Thyroid Testing (FT4)Mercer Island25,506Free T4 Levels Test – Thyroid Testing (FT4)Tumwater24,855Free T4 Levels Test – Thyroid Testing (FT4)Moses Lake24,764Free T4 Levels Test – Thyroid Testing (FT4)North Lynnwood24,562Free T4 Levels Test – Thyroid Testing (FT4)Bainbridge Island24,557Free T4 Levels Test – Thyroid Testing (FT4)Oak Harbor24,267Free T4 Levels Test – Thyroid Testing (FT4)Kenmore23,556Free T4 Levels Test – Thyroid Testing (FT4)Eastmont23,088Free T4 Levels Test – Thyroid Testing (FT4)Union Hill-Novelty Hill23,060Free T4 Levels Test – Thyroid Testing (FT4)Cottage Lake22,779Free T4 Levels Test – Thyroid Testing (FT4)Martha Lake22,251Free T4 Levels Test – Thyroid Testing (FT4)Bonney Lake22,229Free T4 Levels Test – Thyroid Testing (FT4)