Test List

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  • T3, Total (Triiodothyronine)

    Test Name:T3, Total (Triiodothyronine)
    Epic Order Code:LAB137
    CPT Code:84480  
    Specimen(s) Type:Plasma or Serum; 0.5 mL
    Acceptable Container(s):
    Testing Schedule:24 hrs/day, 7 days/week
    Turn Around Time:STAT: 1 hour  
     Routine: 2 hours
    Collection Information:No special patient preparation is required. Obtain specimen by standard collection procedures.
    Transport Information:Deliver to lab immediately. All specimens must be signed into the laboratory.
    Reference Clients:If unable to deliver to the lab within 1 hour, centrifuge the specimen and remove plasma/serum from the red cells. Store and transport at 2-8° C. Specimen must be received in the lab within 24 hours.
    Causes for Rejection:Improperly labeled, incorrect container, contaminated, insufficient quantity, incorrect/delay in transport.
    Reference Range:0 - 4 days: 0.96 - 2.92 ng/mL
     4 - 60 days: 0.62 - 2.43 ng/mL
     2 mo - 2 yrs: 0.81 - 2.81 ng/mL
     2 - 7 yrs: 0.83 - 2.52 ng/mL
     7 - 12 yrs: 0.92 - 2.19 ng/mL
     12 - 19 yrs: 0.83 - 2.15 ng/mL
     > 19 yrs: 0.80 - 2.00 ng/mL
    Additional Information:Therapy with amiodarone can lead to depressed T3 values.
     Phenytoin, phenylbutazone, and salicylates cause release of T3 from the binding proteins, thus leading to a reduction in the total T3 hormone level at normal free T3 levels.