Thyroxine (T4), Total
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Name: Thyroxine (T4), Total
Code: 1744
Sample Type: Serum (Chem)
Turnaround Time (TAT): 7 days
Preparation & Notes
1 mL Serum (Minimum 0.5 mL)/Although very commonly used in assessing thyroid function, the popularity of total T4 as a laboratory test has waned, because it has been recognized that abnormal T4 results occur in euthyroid individuals having altered thyroxine-binding protein. Free T4 and TSH are recommended in preference to total T4