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TBG (Thyroxine Binding Globulin) (870X)

Test Code

30213P

CPT Code(s)

84442

Preferred Specimen(s)

1 mL serum

Minimum Volume

0.5 mL

Transport Temperature

Room temperature

Specimen Stability

Room temperature: 7 days

Refrigerated: 7 days

Frozen: 28 days

Methodology

Chemiluminescence

Performing Laboratory

Quest Diagnostics Nichols Institute

33608 Ortega Highway

San Juan Capistrano, CA 92690-6130

Setup Schedule

Set up: 1 day a week a.m.; Report available: 2 days

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.

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.)

* The tests listed by specialist are a select group of tests offered. For a complete list of Quest Diagnostics tests, please refer to our Directory of Services.