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3230: Thyroxine, Free Index Print View
T Uptake ICMA  25 - 35  % 
T4, Total IA  view ref range  mcg/dL 
Free Thyroxine Index CALC  1.1 - 4.2   

PRIMARY
1 Serum 2 (1) mL   Refrigerated - 4 Day(s)/Frozen - 2 Month(s)  
ALTERNATE

Thyroid function tests to diagnose hypothyroidism or hyperthyroidism. TSH and free T4 are recommended for assessment of thyroid function. Indirect index methods employ two separate tests to estimate the free hormone concentration: total serum T4 (or T3) measurement and an assessment of either TBG or the free hormone fraction. Results of these tests are then combined mathematically to give estimates of the free hormone concentration.
Setup Schedule
Sunday, Tuesday-Saturday

Reported (Analytical Time)
Same day

CPT Codes
84436,84479

The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

Notes
Also known as Free T4 Index.






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For test information, please call Client Services at 800-421-4449.

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