Test Directory

T3 (Triiodothyronine), Reverse, Serum

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Updated Test Information:

Test Description
T3 (Triiodothyronine), Reverse, Serum
Synonym(s)
T3 (Triiodothyronine), Reverse
Test ID
RT3
General Information
Useful for:
An aid in the diagnosis of the "sick euthyroid" syndrome
Specimen Type
Serum
Specimen Requirements
Red Top
Stability
Refrigerated (preferred) 28 days
Ambient 28 days
Frozen 28 days
Unacceptable Specimen Conditions
Gross hemolysis Reject
Gross lipemia OK
Gross icterus OK
Methodology
Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)
Estimated TAT
2-6 days
Testing Schedule
Monday, Wednesday, Thursday, Friday
CPT Code(s)
84482
Minimum Sample Volume
0.4 mL
Reference Range
10-24 ng/dL
Performing Lab
Mayo
LOINC Code(s)
3052-8