Test Details
Mnemonic
TSI
Ordering Code
3426720
CPT-4 Code(s)
84445
Specimen Information
Collect
Serum separator tube (SST)
Specimen Preparation
Centrifuge, separate serum from cells and send 1.0 mL serum in a screw capped plastic vial.
Alternate Specimen
Serum: Red top
Minimum Volume
0.5 mL
Transport Temperature
Refrigerated
Rejection Criteria
Gross hemolysis, lipemia, icterus, plasma
Stability
Room temperature: Undetermined
Refrigerated: 7 days
Frozen: 12 months
Refrigerated: 7 days
Frozen: 12 months
Methodology
Chemiluminescence
Reference Range
<0.10 IU/L
Performing Laboratory
Warde Medical Laboratory