T4 - Overview: T4 (Thyroxine), Total Only, Serum

Test Catalog

Test Name

Test ID: T4    
T4 (Thyroxine), Total Only, Serum

Useful For Suggests clinical disorders or settings where the test may be helpful

Monitoring treatment with synthetic hormones (synthetic triiodothyronine will cause a low total thyroxine: T4)


Monitoring treatment of hyperthyroidism with thiouracil and other antithyroid drugs

Testing Algorithm Delineates situations when tests are added to the initial order. This includes reflex and additional tests.

See Thyroid Function Ordering Algorithm in Special Instructions.

Special Instructions and Forms Library of PDFs including pertinent information and consent forms, specimen collection and preparation information, test algorithms, and other information pertinent to test

Method Name A short description of the method used to perform the test

Electrochemiluminescence Immunoassay

NY State Approved Indicates the status of NY State approval and if the test is orderable for NY State clients.


Reporting Name A shorter or abbreviated version of the Published Name for a test; an abbreviated test name

T4 (Thyroxine), Total Only, S

Aliases Lists additional common names for a test, as an aid in searching

T4, Serum
Thyroid Hormone
Thyroxine, Total
T4 Total Only, S
Thyroxine (T4)