Lab Dept:

Chemistry

Test Name:

Thyroxine Binding Globulin

General Information

Lab Order Codes:

TBG

Synonyms:

TBG

CPT Codes:

84442 – Thyroxine binding globulin

Test Includes:

TBG reported in mg/dL.

Logistics

Test Indications:

N/A

Lab Testing Sections:

Chemistry - Sendouts

Referred to:

Esoterix Inc. (ESL Test: 500318)

Phone Numbers:

MIN Lab: 612-813-6280

STP Lab: 651-220-6550

Test Availability:

Daily, 24 hours

Turnaround Time:

2 - 5 days, test set up Monday-Friday

Special Instructions:

N/A

Specimen

Specimen Type:

Blood

Container:

Red top tube Alternate tube: Lavendar (EDTA) top tube

Draw Volume:

3 mL (Minimum: 0.9 mL) blood

Processed Volume:

1 mL (Minimum: 0.3 mL) serum

Note: Minimum value does not allow for repeat analysis.

Collection:

Routine venipuncture

 

Special Processing:

Lab Staff: Centrifuge specimen, remove serum aliquot into a screw-capped round bottom vial. Separate within one hour of collection. Store and ship frozen. Forward promptly.

Patient Preparation:

None

Sample Rejection:

Mislabeled or unlabeled specimens

Interpretive

Reference Range:

Age

Range (ug/mL)

Children:

12.7 – 27.9

Adults:

13 – 39

Critical Values:

N/A

Limitations:

N/A

Methodology:

Competitive Immunoassay (ICMA – Chemiluminescent) Assay

References:

Esoterix Inc. “Expected Value and S.I. Unit Conversion Table”, 5th Edition

Esoterix Laboratories July 2012

Updates:

9/27/2010: Minimum volume, method (previously listed as Double antibody RIA) and reference range update