Triiodothyronine, Free (Free T3) : ARUP Lab Tests

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Triiodothyronine, Free (Free T3) : 0070133

Mnemonic: FT3

Methodology:	Quantitative Electrochemiluminescent Immunoassay
Performed:	Sun-Sat
Reported:	Within 24 hours
Specimen Required:	Collect: Serum separator tube or plasma separator tube. Also acceptable: Lavender (EDTA) or pink (K₂EDTA). 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: 0-3 days: 2.0-7.9 pg/mL 4-30 days: 2.0-5.2 pg/mL 1-24 months: 1.6-6.4 pg/mL 2-6 years: 2.0-6.0 pg/mL 7-17 years: 2.9-5.1 pg/mL 18 years and older: 2.4-4.2 pg/mL
CPT Code(s):	84481
Cross References:	T3, Free (Triiodothyronine, Free (Free T3))

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