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  • T4, Free (Thyroxine)

    Test Name:T4, Free (Thyroxine)
    Epic Order Code:LAB127
    CPT Code:84439  
    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: 0.66 - 2.71 ng/dL
     4 - 60 days: 0.83 - 3.09 ng/dL
     2 mos - 2 yrs: 0.48 - 2.34 ng/dL
     2 - 7 yrs: 0.85 - 1.75 ng/dL
     7 - 12 yrs: 0.90 - 1.67 ng/dL
     12 - 19 yrs: 0.93 - 1.60 ng/dL
     > 19 yrs: 0.93 - 1.70 ng/dL
    Additional Information:Furosemide causes elevated free T4 results at the daily therapeutic dosage level.