ARUP's Laboratory Test Directory

Triiodothyronine, Total (Total T3) : 0070474

Mnemonic: T3 TOTAL

Ordering Recommendation: Not recommended for routine thyroid screening.
Methodology: Quantitative Electrochemiluminescent Immunoassay
Performed: Sun-Sat
Reported: Within 24 hours
Specimen Required: Collect: Plasma separator tube or serum separator tube. Also acceptable: Lavender (EDTA), pink (K2EDTA), or green (sodium or lithium heparin).

Specimen Preparation: Allow specimen to clot completely at room temperature. Separate serum or plasma from cells ASAP or within 2 hours of collection. Transfer 1 mL serum or plasma to an ARUP Standard Transport Tube. (Min: 0.5 mL)

Storage/Transport Temperature: Refrigerated.

Unacceptable Conditions: Grossly hemolyzed specimens.

Stability (collection to initiation of testing): After separation from cells: Ambient: 24 hours; Refrigerated: 1 week; Frozen: 1 month
Reference Interval:
 
Cord blood 14-86 ng/dL
0-3 days 96-292 ng/dL
4-30 days 62-243 ng/dL
1-23 months 81-281 ng/dL
2-6 years 83-252 ng/dL
7-11 years 92-219 ng/dL
12-19 years 83-215 ng/dL
20 years and older 80-200 ng/dL

CPT Code(s): 84480
Cross References: T3 Total (Triiodothyronine, Total (Total T3)), Total T3 (Triiodothyronine, Total (Total T3))