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Test Compendium

6147: THYROXINE, FREE (FT4)

Test Code

  • 6147

Test Synonym

  • FREE T4, FREE THYROXINE, FT4

Volume

  • 1 mL

Minimum Volume

  • 0.2 mL

Specimen Requirements

  • Serum

Container

  • Serum Separator Tube, Transfer Tube- Serum, Plain Red Top Tube

Storage

  • Refrigerated

Turn Around Time

  • 1 day

Special Instructions

  • 1 SST

Specimen Stability

  • Stable for 5 days at 15-25 °C, 7 days at 2-8 °C, 30 days at -20 °C. Freeze only once.

Reference Range

  • Fasting Sex Message Lines Ref Ranges Unit of Measure
    0.80 - 1.70 ng/dL