Printable Test Catalog - OU Medicine

CPT: 84481
[T3REV] Reverse Triiodothyronine (T3)
SPECIMEN REQUIRED: Refrigerated serum or plasma
TUBE OR CONTAINER: Red, Gold, Green (heparin) or Lavender (EDTA)
SPECIAL HANDLING: No radioisotopes administered 24 hours prior
to venipuncture
SPECIMEN VOLUME: 0.5 mL
MINIMUM VOLUME: 0.3 mL (this volume does not allow for repeat
testing
TEST AVAILABILITY: Daily
TURNAROUND TIME: 2-3 days
REFERENCE RANGE: 1-4 years: 150-710 pg/mL
5-9 years: 170-790 pg/mL
10-15 years: 190-880 pg/mL
older than 15 years: 90-350 pg/mL
OTHER NAMES: Reverse Tri-iodothyronine
METHODOLOGY: Radioimmunoassay (RIA)
CLINICAL USE: Evaluating the euthyroid sick patient with low T3
concentrations; also useful in evaluating thyroid
function and metabolism
CPT: 84482
[T3TOT] Total Triiodothyronine
SPECIMEN REQUIRED: Refrigerated serum
TUBE OR CONTAINER: Gold or Red
SPECIMEN VOLUME: 1 mL
MINIMUM VOLUME: 0.3 mL
TEST AVAILABILITY: Daily
TURNAROUND TIME: 1-2 days
REFERENCE RANGE: Age and gender specific
OTHER NAMES: T3 Hormone; T3; Tri-iodothyronine
METHODOLOGY: Immunochemiluminometric assay (ICMA)
CLINICAL USE: Thyroid function which is particularly useful in
diagnosis of T3 thyrotoxicosis, in which T3 is
increased an T4 is within normal limits
CPT: 84480
[T4] Thyroxine (T4)
SPECIMEN REQUIRED: Refrigerated plasma or serum
TUBE OR CONTAINER: Light Green (heparin) or Gold
SPECIMEN VOLUME: 1 mL
MINIMUM VOLUME: 0.5 mL
TEST AVAILABILITY: Daily
TURNAROUND TIME: 24 hours
REFERENCE RANGE: Age specific
OTHER NAMES: T4, Total; Tetraiodothyronine
METHODOLOGY: Chemiluminescence
CLINICAL INFORMATION: Thyroid function test
CPT: 84436