Test library
Thyroid Blood Test
Thyroid tests measure hormone levels and related markers to assess how well the thyroid gland is working. They help evaluate symptoms of an underactive or overactive thyroid and can be ordered without a referral.
Order Thyroid Tests
Order online and visit a local collection site, or choose an at-home kit where available. No referral and no insurance required.
Order Thyroid Tests- Typical turnaround
- 1-3 business days
- Starting price
- From $119
- Results
- Confidential, online
Quick answer
Thyroid tests are a group of blood measurements that assess how well the thyroid gland is working. They typically include thyroid-stimulating hormone and thyroid hormones, and sometimes thyroid antibodies. The tests are used to investigate symptoms such as fatigue, weight change, and temperature sensitivity, and results are interpreted by a qualified healthcare provider.
What this test measures
The thyroid gland produces hormones that regulate metabolism, energy use, and body temperature. When it produces too little or too much hormone, symptoms can develop gradually and overlap with many other conditions. Blood tests give an objective measure of thyroid activity that helps a provider narrow down what is happening.
A typical thyroid evaluation includes thyroid-stimulating hormone, or TSH, and may add free thyroxine, free triiodothyronine, and thyroid antibodies. A single blood draw provides the sample. Which markers are included depends on the symptoms and the provider's assessment, and results are compared with reference ranges.
Thyroid testing is common and can be done for screening, diagnosis, or monitoring. It is not a diagnosis on its own; the numbers are interpreted with symptoms and examination findings. A qualified healthcare provider decides which tests are appropriate and what any result means for a particular person.
- Thyroid-stimulating hormone (TSH)
- Free thyroxine (free T4)
- Free triiodothyronine (free T3)
- Total thyroxine (T4)
- Total triiodothyronine (T3)
- Thyroid peroxidase antibodies (TPOAb)
- Thyroglobulin antibodies (TgAb)
- Thyroglobulin level (when ordered)
Why people order this test
- Evaluate symptoms of an underactive thyroid
- Investigate signs of an overactive thyroid
- Screen for thyroid problems
- Monitor a known thyroid condition
- Follow up on an earlier abnormal thyroid result
- Check thyroid antibodies when autoimmunity is suspected
How to prepare
No fasting is usually required for thyroid blood tests. A sample is collected from a vein, usually at the arm. Follow any timing instructions provided by the laboratory, and tell the ordering provider about thyroid medications.
Understanding your results
Results are typically available within one to three business days. The report lists each thyroid marker with its reference range. A qualified healthcare provider interprets the values together with symptoms and decides whether further testing or follow-up is needed.
Thyroid Blood Test by state
Alabama
Thyroid Blood Test across Alabama.
Alaska
Thyroid Blood Test across Alaska.
Arizona
Thyroid Blood Test across Arizona.
Arkansas
Thyroid Blood Test across Arkansas.
California
Thyroid Blood Test across California.
Colorado
Thyroid Blood Test across Colorado.
Connecticut
Thyroid Blood Test across Connecticut.
Delaware
Thyroid Blood Test across Delaware.
Florida
Thyroid Blood Test across Florida.
Georgia
Thyroid Blood Test across Georgia.
Hawaii
Thyroid Blood Test across Hawaii.
Idaho
Thyroid Blood Test across Idaho.
Related tests
12 Panel Drug Test (Drugs of Abuse Testing), Hair
Compare 12 Panel Drug Test (Drugs of Abuse Testing), Hair options and order online.
12 Panel Drug Testing
Compare 12 Panel Drug Testing options and order online.
7 Panel Drug Test (Drugs of Abuse Testing), Hair
Compare 7 Panel Drug Test (Drugs of Abuse Testing), Hair options and order online.
9 Panel Drug Test
Compare 9 Panel Drug Test options and order online.
9 Panel Drug Test (Drugs of Abuse Testing), Hair
Compare 9 Panel Drug Test (Drugs of Abuse Testing), Hair options and order online.
Frequently Asked Questions
What do thyroid tests measure?
They measure thyroid hormones and related markers, such as TSH, free T4, and sometimes thyroid antibodies, to assess how the thyroid is working.
Which thyroid test is ordered first?
TSH is often the first test because it reflects the pituitary's signal to the thyroid. Other markers are added based on the result and symptoms.
Do I need a doctor's referral?
Availability varies by laboratory and location. Many thyroid tests can be ordered directly, and the testing provider can explain what is available.
Do I need to fast?
Fasting is not usually required for thyroid tests unless they are bundled with other panels that call for it.
Can thyroid results change over time?
Yes. Thyroid levels can shift, so a single result may be repeated or monitored over time depending on the clinical picture.
Ready to get tested?
Order online and visit a collection site near you, or choose a mail-in kit. No referral and no insurance required.
Reviewed by the LabOrdering Editorial Team
Every page on this site is reviewed for clarity, sourcing, and accuracy. We update our library as testing options, collection networks, and accreditation standards change.