Recommendations when to order or not order the test. May include related or preferred tests.
Mnemonic
Unique test identifier.
T3RT3RATIO
Methodology
Process(es) used to perform the test.
Quantitative Liquid Chromatography-Tandem Mass Spectrometry
Performed
Days of the week the test is performed.
Mon-Sun
Reported
Expected turnaround time for a result, beginning when ARUP has received the specimen.
1-4 days
New York DOH Approval Status
Indicates test has been approved by the New York State Department of Health.
This test is New York DOH approved.
Specimen Required
Patient Preparation
Collect
Serum separator tube or plain red. Also acceptable: Lavender (EDTA) or pink (K2EDTA).
Specimen Preparation
Allow serum specimen to clot completely at room temperature. Separate serum or plasma from cells ASAP or within two hours of collection. Transfer 2 mL serum or plasma to an ARUP Standard Transport Tube. (Min: 1 mL)
Storage/Transport Temperature
Frozen.
Unacceptable Conditions
Grossly hemolyzed specimens.
Remarks
Stability
After separation from cells: Ambient: 24 hours; Refrigerated: 1 week; Frozen: 3 months
Reference Interval
Normal range/expected value(s) for a specific disease state. May also include abnormal ranges.
Test Number
Components
Reference Interval
Triiodothyronine, Reverse - LC-MS/MS
Age
ng/dL
0-17 years
Not Applicable
18 years and older
9.0-27.0
Triiodothyronine, Total - LC-MS/MS
Age
ng/dL
Cord Blood
14-86
0-3 days
96-292
4-30 days
62-243
1-23 months
81-281
2-6 years
83-252
7-11 years
92-219
12-19 years
83-215
20 years and older
80-200
Triiodothyronine, Ratio (T3:RT3)
Age
Ratio
0-17 years
Not Applicable
18 years and older
4.2-11.0
Interpretive Data
Background information for test. May include disease information, patient result explanation, recommendations, details of testing, associated diseases, explanation of possible patient results.
This test was developed and its performance characteristics determined by ARUP Laboratories. It has not been cleared or approved by the US Food and Drug Administration. This test was performed in a CLIA certified laboratory and is intended for clinical purposes.
Compliance Category
Laboratory Developed Test (LDT)
Note
Additional information related to the test.
Hotline History
N/A
CPT Codes
The American Medical Association Current Procedural Terminology (CPT) codes published in ARUP's Laboratory Test Directory are provided for informational purposes only. The codes reflect our interpretation of CPT coding requirements based upon AMA guidelines published annually. CPT codes are provided only as guidance to assist clients with billing. ARUP strongly recommends that clients confirm CPT codes with their Medicare administrative contractor, as requirements may differ. CPT coding is the sole responsibility of the billing party. ARUP Laboratories assumes no responsibility for billing errors due to reliance on the CPT codes published.
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.
Aliases
Other names that describe the test. Synonyms.
T3 total and reverse
Total and reversed Triiodothyronine T3 total and reverse
Triiodothyronine, Total and Triiodothyronine, Reverse with Ratio Calculation by Tandem Mass Spectrometry
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