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Test Name:
T3, Reverse
- SBMF No:
44131 - Performance Lab Name:
ARUP Laboratories - Test Mnemonic:
T3 REV - ABN:
Required – Not FDA-Approved - CPT Code:
84482 - LOINC Code:
3052-8 - Ref Lab Test No:
0070188 - Also Known As:
Reverse T3
Reverse Triiodothyronine
Triiodothyronine, Reverse - Spec Type:
Serum or plasma - Spec Container:
Gold top (SST), Red top (serum), or Lavender top (EDTA) tube - Pref Vol:
1.0 mL - Min Vol:
0.3 mL - Fasting:
No - Spec Collect:
Routine venipuncture - Spec Process:
Serum sample tubes, clot 30 minutes
Promptly centrifuge 15 minutes
Immediately transfer serum or plasma to separate plastic tube and freeze - Spec Store Transport:
Frozen - Spec Stability:
After separation from cells:
24 hours at room temperature (20-30°C)
1 week refrigerated (2-8°C)
3 months frozen (-20°C) – Do not use frost-free units that undergo repeated freeze/thaw cycles - Methodology:
Quantitative Radioimmunoassay (RIA) - Clinical Significance:
Refer to:
- Reference Range:
Birth-6 days: 600-2500 pg/mL
7 days and older: 90-350 pg/mL - Additional Test Info:
This test was developed and its performance characteristics determined by ARUP Laboratories. The U.S. Food and Drug Administration has not approved or cleared this test; however, FDA clearance or approval is not currently required for clinical use. The results are not intended to be used as the sole means for clinical diagnosis or patient management decisions. - Day Run:
Mon-Sun - Time Reported:
2-4 days - Test Type:
HORMONE
