Test ID: T4
T4 (Thyroxine), Total Only, Serum
Secondary ID 
A test code used for billing and in test definitions created prior to November 2011
8724
NY State Approved Indicates the status of NY State approval and if the test is orderable for NY State clients.
Yes
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.
Total T4 levels offer a good index of thyroid function when the thyroid-binding globulin is normal and nonthyroidal illness is not present.
Testing Algorithm Delineates situation(s) 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 Describes specimen collection and preparation information, test algorithms, and other information pertinent to test. Also includes pertinent information and consent forms to be used when requesting a particular test
Method Name A short description of the method used to perform the test
Immunoenzymatic Assay
Reporting Name A shorter/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
Syn-Thyroid
T4 Total Only, S MMLNE only
T4, Serum
Tetraiodothyronine
Thyroid Hormone
Thyroxine (ORDER 8724 if not specified)
Thyroxine (T4), Total & Free ORDER 8684
Thyroxine, Total
T4 Total Only, S MMLNE only
T4, Serum
Tetraiodothyronine
Thyroid Hormone
Thyroxine (ORDER 8724 if not specified)
Thyroxine (T4), Total & Free ORDER 8684
Thyroxine, Total
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