THYROID STIMULATING IMMUNOGLOBULIN (TSI)

Test Documentation
Specimen Required
Draw blood in a SST tube. 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
Gross hemolysis, lipemia, icterus, plasma

Methodology
Chemiluminescence

Stability
Room Temperature: Unacceptable; Refrigerated: 7 days; Frozen: 2 months

Reference Range
<0.10 IU/L

Performed
Monday-Friday

Turnaround Time3 days
Test CodeTSI
CPT-4 Code (s)
84445
LOINC Codes
30567-2

Warde
Medical
Laboratory