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

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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