Thyroxine Binding Globulin

Test Code: TD_4932

CPT Code(s): 84442

$29

Test Details

Alternative Name(s)

TBG
Thyroid binding globulin

Test Includes

Thyroxine Binding Globulin

Methodology

Chemiluminescence

Rejection Criteria

Hemolysis
gross lipemia
room temperature samples
plasma

Reference Range(s)

14.0-31.0 UG/ML

Specimen Requirements

Preferred Specimen

Serum separator tube (SST)

Minimum Volume

0.5 mL serum

Sample Stability

Unacceptable room temperature
2 days refrigerated
30 days frozen

Transport Temperature

Critical Frozen (cfz)

Collection Instructions

1 mL serum. Allow SST to clot in an upright position for at least 30 minutes, then centrifuge sample within 2 hours of collection. Transfer serum to a plastic transport tube. Clearly label tube as serum. Freeze. Critical Frozen (CFZ). When multiple tests are ordered, submit separate tube for this test.

Alternative Specimen

1 mL serum from a plain red top tube. Allow sample to clot in an upright position for at least 60 minutes, then centrifuge sample and transfer serum to a plastic transport tube within 2 hours of collection. Clearly label tube as serum from a plain red top tube. Freeze. Critical Frozen (CFZ). When multiple tests are ordered, submit separate tube for this test.