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T4 (Thyroxine), Total
- Ordering Info
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**IMPORTANT: CPT Code is informational only; obtain the Test Code for ordering.
Nonthyroidal chronic diseases, nicotinic acid and nutrition may decrease results. Thyrotoxicosis may not always cause abnormal results. Binding protein variations may cause variations in results. Increases may be associated with pregnancy or oral contraceptive use.
|T4 (Thyroxine), Total|
|<1 Month||4.5-17.2 mcg/dL||4.5-17.2 mcg/dL|
|1-23 Months||5.9-13.9 mcg/dL||5.9-13.9 mcg/dL|
|2-12 Years||5.7-11.6 mcg/dL||5.7-11.6 mcg/dL|
|13-20 Years||5.1-10.3 mcg/dL||5.3-11.7 mcg/dL|
|>20 Years||4.9-10.5 mcg/dL||5.1-11.9 mcg/dL|
|Free T4 Index (T7)||1.4-3.8||1.4-3.8|
For diagnosis of hypothyroidism and hyperthyroidism.
Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.
The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.
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