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Test Name:
Resin T3 Uptake Ratio
- SBMF No:
43192 - Performance Lab Name:
Esoterix Inc - Test Mnemonic:
RESIN T3UP - ABN:
May be required – Medical Necessity - CPT Code:
84479 - LOINC Code:
19146-0 - Ref Lab Test No:
500324 (Quest# S50479) - Also See:
30017 Thyroid Stimulating Hormone, Sensitive
44637 Thyroid Panel - Spec Type:
Serum - Spec Container:
Gold top (SST) or red top (serum) tube - Pref Vol:
1.0 mL - Min Vol:
0.3 mL - Fasting:
No - Spec Collect:
Routine venipuncture - Spec Process:
Clot 30 minutes
Promptly centrifuge 15 minutes
Immediately transfer serum to separate plastic tube and freeze - Spec Store Transport:
Frozen - Spec Stability:
12 months frozen (-20°C) – Do not use frost-free units that undergo repeated freeze/thaw cycles - Methodology:
Competitive immunoassay (ICMA) - Use:
Obsolete test
With the implementation of highly accurate assays for Sensitive Thyroid Stimulating Hormone (sTSH) and Free Thyroxine, it has been determined that, for evaluation of thyroid function status, there is no longer a need for the T3 Uptake result and the calculation of FTI. See SBMF Technical Notice from September 2004. - Reference Range:
- Resin T3 Uptake
- Children and Adults: 22.5-37.0%
Mean normal value: 30% - Resin T3 Uptake Ratio
- Children and Adults: 0.75-1.23
- Additional Test Info:
This test is referred through Quest Diagnostics Nichols Institute. - Day Run:
Tue, Fri - Time Reported:
Same day
This is a sendout test. Please note that turnaround time is defined as the anticipated time from set up day to results release. - Test Type:
HORMONE
