Thyroxine Binding Globulin
| Abbrev Code: | TBG | ||
| Order Code: | LAB128 | Order Name: | Thyroxine Binding Globulin |
| Synonyms: | T4 Binding Capacity | ||
| Methodology: | Chemiluminescent immunoassay | ||
| CPT Codes: | 84442 x1 | ||
| Turnaround Time: | Specimens are sent to reference laboratory Mon-Sat; results are reported within 1-4 days. Testing performed on Mon., Wed, and Fri. | ||
Collection Instructions
| Specimen: | Blood |
| Optimal Volume: | 1 mL |
| Minimum\Peds Volume: | 1 mL |
| Container: | Red or gold (gel) Alternate Containers: Red (no gel) |
| Causes for Rejection: | Plasma, grossly hemolyzed or lipemic specimens. |
Processing and Shipping
| Specimen Processing: | Centrifuge and aliquot 0.5 mL, 0.4 mL minimum. Store in freezer. |
| Shipping Instructions: | Ship on dry ice. |
| Test Performed at or Referral Lab | Lab Sendouts (ARUP) |
| Referral Lab number: | 70410 (TBG) |
Interpretive
| Reference Range: | 13.0-30 ug/mL |
| Use: | Determination of thyroxine binding globulin (TBG) levels is particularly useful for cases in which total thyroid hormone levels do not correlate with the thyrometabolic status, such as with pregnancy, the use of contraceptive steroids, or in patients with hereditary excesses or deficiencies of TBG. |
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