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Order Code LAB1399 T3 Total, Serum and Plasma

Additional Codes

Test Name in EPIC

EPIC Test Code           

Mnemonic

RV T3, TOTAL

LAB1399

T3

 

Useful For

Second-order testing for hyperthyroidism in patients with low thyroid-stimulating hormone values and normal thyroxine levels.

Specimen Requirements

Specimen Type: Serum and Plasma

Container/Tube: 

Preferred: Green top (Lithium Heparin) gel tube

Acceptable: Plain, red-top tube and SST

Specimen Volume: 2.0 mL

Minimum Volume: 1.0 mL

Specimen Stability

Specimen Type Temperature Stability            
Serum and Plasma Ambient 24 hours
  Refrigerated (preferred) 7 days
  Frozen 4 weeks

Reference Range

97-169  ng/dL

New Reference Range Starting May 19th, 2025 for the 2nd Generation TT3 Assay: 
82-158 ng/dL
Results between 1st and 2nd generation assays should not be used interchangeably.

Day(s) Test Set Up

Monday through Sunday

Performing Laboratory

Ridgeview Medical Center Laboratory

Methodology

Competitive Immunoassay

CPT

84480