THYROXINE-BINDING GLOBULIN (TBG)

Test Documentation
Specimen Required
Draw blood in a SST. Centrifuge, separate and send 1.0 mL serum (0.5 mL minimum) refrigerated in a screw-capped plastic vial.

Alternate Specimen
Serum: Red-top

Rejection Criteria
Hemolyzed, grossly lipemic specimens, plasma

Methodology
Chemiluminescence

Stability
Room Temperature: Unacceptable; Refrigerated: 2 days; Frozen: 1 month

Reference Range
14.0-31.0 µg/mL

Performed
Monday-Friday

Turnaround Time3 days
Test CodeTBG
CPT-4 Code (s)
84442
LOINC Codes
3021-3

Warde
Medical
Laboratory