ARUP's Laboratory Test Directory

0070188: Triiodothyronine, Reverse

Test Mnemonic: RT3
Methodology: Radioimmunoassay

Performed: Tue-Fri

Reported: 1-5 days

Specimen Required:  
Collect: One 4 mL SST.  Also acceptable: lavender (EDTA) or pink (K2 EDTA).

Transport: 1 mL serum or plasma, frozen. (Min: 0.3 mL)  Submit sample in an ARUP Standard Transport Tube.

Pediatric Collection/Transport: 0.2 mL serum or plasma, frozen.

Stability: After separation from cells: Ambient: 24 hours; Refrigerated: 1 week; Frozen: 3 months

Reference Interval:
Birth-6 days: 600-2500 pg/mL
7 days and older: 90-350 pg/mL

Interpretive Data:


Please refer to Statement D in the Compliance Statements section in the front of the Laboratory Test Directory.



CPT Code(s):
84482