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Thyroxine, Total

NOTE: Multiple lab options. Use our Lab Locator to find closest.

T4 (Thyroxine), Total

Laboratory: LabCorp
Thyroxine, Total
Laboratory: Quest Diagnostics

High levels of T4 may be a result of an overactive thyroid, while low levels of T4 can be caused by an underactive thyroid. The results of this test, in combination with the results of other thyroid tests, can determine the presence of thyroid disease, and the degree of severity of thyroid disease.

1. Purchase Tests

Choose the test you want (be sure to pick the laboratory you want to use).

Pay by credit card or PayPal®.

You pay directly and we do not bill your insurance.

(Note: A $10 laboratory fee is added to your total when you purchase one or more blood tests.)

2. Visit a Lab

After purchasing your testing you will receive an email with your lab requisition.  Bring this form to the laboratory.

NOTE: Be sure to visit the appropriate laboratory! 

If you choose LabCorp only visit a Labcorp location. 
If you choose Quest Diagnostics only visit a Quest location!

Find Your Lab Location.

No appointment is needed, but making one can minimize your wait time. 

If you have selected the option to have an At Home Test Kit delivered to you, you will receive your test kit in the mail within 5 to 7 business days. (Not all tests are available as At Home Test Kits.)

3. Get Results

We’ll email you when your results are ready. Sign into your account to view and download your result reports.

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