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TBG (Thyroxine Binding Globulin)
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CPT Code(s)
84442
Methodology
Chemiluminescence
Reference Range(s)
| Adult Male | 12.7-25.1 | µg/mL | |||||||||||||
| Adult Female | 13.5-30.9 | µg/mL | |||||||||||||
| Pediatric | |||||||||||||||
| 4-6 Years | 14.8-32.9 | µg/mL | |||||||||||||
| 7-8 Years | 16.3-30.7 | µg/mL | |||||||||||||
| 9-10 Years | 15.8-27.4 | µg/mL | |||||||||||||
| 11 Years | 15.5-27.4 | µg/mL | |||||||||||||
| 12 Years | 14.8-26.2 | µg/mL | |||||||||||||
| 13 Years | 13.8-25.2 | µg/mL | |||||||||||||
| 14 Years | 12.2-25.2 | µg/mL | |||||||||||||
| 15 Years | 10.8-23.8 | µg/mL | |||||||||||||
| 16 Years | 10.0-23.8 | µg/mL | |||||||||||||
| 17 Years | 8.5-23.1 | µg/mL | |||||||||||||
Clinical Significance
The measurement of TBG can be used to establish the presence of TBG deficiency or excess suggested by abnormal Total serum T4 and T3 concentrations in the presence of normal free levels of these hormones. Definitive documentation of a TBG derangement may avoid unnecessary diagnostic procedures and therapy in individuals with harmless congenital TBG anomalies, and in their relatives.
Alternative Name(s)
Thyroxine Binding Globulin
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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