The assay may be useful in the diagnosis of nonthyroidal illness (NTI). Patients with NTI have low T3 concentrations and increased concentrations of rT3. RT3 may be useful in neonates to distinguish euthyroid sick syndrome from central hypothyroidism.
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- Fasting Required: NO
- Preferred Specimen: Serum
- Reference Range(s): 8-25 ng/dL
- Turnaround Time: 3 Days
- Test Code: 90963