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Test Code RVST3 / 070104-LC TRIIODOTHYRONINE (T3), REVERSE, SERUM

Performing Laboratory

Laboratory Corporation of America (LabCorp)

Useful For

Diagnosing of nonthyroidal illness (NTI)

Method Name

Liquid Chromatography-Tandem Mass Spectrometry (LC-MC/MS)

Reference Values

Premature infant:

(26-31 weeks): 33.0-147.0 ng/dL

(32-35 weeks): 49.0-217.0 ng/dL

Full term infant:

(2-7 days): 33.0-206.0 ng/dL

8 days-5 months: 13.0-107.0 ng/dL

6-12 months: 8.1-52.8 ng/dL

1-15 years: 8.3-22.9 ng/dL

=16 years: 9.2-14.1 ng/Dl

Days and Times Test Performed

Monday through Friday

Report Available

3 Days

Specimen Type

Serum

Preferred Container

Serum Separator Tube (SST)

Preferred Volume

Serum: 1.2 mL (Serum Separator Tube (SST)) – 0.8 mL does not allow for repeat testing

Minimum Volume

Serum: 0.8 mL (Serum Separator Tube (SST)) – 0.8 mL does not allow for repeat testing

Specimen Collection and Handling

Spin specimen, separate from clot and send refrigerated.

Specimen Stability Information

Specimen Type: Serum

Frozen: 14 Days

Refrigerated: 14 Days

Room Temp: 14 Days

Note: Stable x3 freeze/thaw cycles.

Add On Capable

Contact Reference Lab – If add-on can never be done, report the test to the Administrative Analyst

Advance Beneficiary Notice Requirements

No ABN Required

CPT Code Information

CPT Code

CPT Description

CPT Disclaimer
84482 Triidothyronine T3, Reverse, Quantitative  

Performing Laboratory Location

Laboratory Corporation of America (LabCorp)

LOINC Code Information

3052-8

Clinical Significance

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.

Keywords

REVERSE T3

RT3

Acceptable Alternative Container(s)

Red Top Tube