Sign in →

Test Code TBGLM Thyroxine-Binding Globulin (TBG), Serum

Additional Codes

MAYO: TBGI

EPIC: LAB128

Reporting Name

Thyroxine Binding Globulin, S

Useful For

Cases in which total thyroid hormone levels do not correlate with the thyrometabolic status, most commonly with pregnancy or the use of contraceptive steroids

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Specimen Type

Serum


Specimen Required


Patient Preparation: For 12 hours before specimen collection, do not take multivitamins or dietary supplements containing biotin (vitamin B7), which is commonly found in hair, skin, and nail supplements and multivitamins.

Container/Tube:

Preferred: Red top

Acceptable: Serum gel

Specimen Volume: 0.5 mL


Specimen Minimum Volume

0.35 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Serum Refrigerated (preferred) 7 days
  Frozen  30 days

Reference Values

Males: 12-26 mcg/mL

Females: 11-27 mcg/mL

 

For SI unit Reference Values, see https://www.mayocliniclabs.com/order-tests/si-unit-conversion.html

Day(s) Performed

Monday, Wednesday, Friday

Test Classification

This test has been cleared, approved, or is exempt by the US Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.

CPT Code Information

84442

LOINC Code Information

Test ID Test Order Name Order LOINC Value
TBGI Thyroxine Binding Globulin, S 3021-3

 

Result ID Test Result Name Result LOINC Value
TBGI Thyroxine Binding Globulin, S 3021-3

Report Available

1 to 3 days

Reject Due To

Gross hemolysis Reject
Gross lipemia OK

Method Name

Solid-Phase Chemiluminescent Assay

Secondary ID

9263