Laboratory Services
FTI (Free Thyroxine Index)
Print this pageUpdated Test Information:
| Test Description |
FTI (Free Thyroxine Index)
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| Synonym(s) |
FTI
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| Test ID |
FTI
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| General Information |
Includes T4, T4 Uptake, and calculation of FTI
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| Specimen Type |
Serum
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| Specimen Requirements |
SST
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| Alternate Specimen Type |
Red, Li‑heparin, K2‑EDTA and K3‑EDTA plasma
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| Minimum Sample Volume |
1 mL
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| Pediatric Min. Volume (if applicable) |
500 uL
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| Stability |
4 days at 20‑25 °C,
8 days at 2‑8 °C, 12 months at ‑20 °C (± 5 °C) Freeze only once |
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| Methodology |
electrochemiluminescence immunoassay “ECLIA”
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| Estimated TAT |
0-2 days
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| Testing Schedule |
Monday-Saturday
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| CPT Code(s) |
84479
84436 |
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| Reference Range |
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| Performing Lab |
Incyte Diagnostics
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| LOINC Code(s) |
32215-6
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