Search our extensive Laboratory Test Directory to find test codes, ordering recommendations, specimen stability information, Test Fact Sheets, and more.
Recommendations when to order or not order the test. May include related or preferred tests.
Not recommended for routine evaluation of thyroid disorders. When FT3 measurement is indicated, the preferred test is Triiodothyronine, Free (Free T3), 0070133. Consider this test when abnormalities of thyroid hormone binding are suspected or routine test results are inconsistent with the clinical presentation. Certain medications may affect FT3 concentrations.
New York DOH Approval Status
Indicates whether a test has been approved by the New York State Department of Health.
This test is New York state approved.
Specimen Required
Patient PreparationInstructions patient must follow before/during specimen collection.
CollectSpecimen type to collect. May include collection media, tubes, kits, etc.
Plain red or lavender (K2EDTA). Also acceptable: Serum separator tube (SST), lavender (K3EDTA), pink (K2EDTA), plasma preparation tube (PPT) or green (sodium heparin).
Specimen PreparationInstructions for specimen prep before/after collection and prior to transport.
Separate from cells ASAP or within 45 minutes of collection. Transfer 1 mL serum or plasma to an ARUP standard transport tube. (Min: 0.3 mL) Test is not performed at ARUP; separate specimens must be submitted when multiple tests are ordered.
Storage/Transport TemperaturePreferred temperatures for storage prior to and during shipping to ARUP. See Stability for additional info.
Frozen. Also acceptable: Refrigerated or room temperature.
Unacceptable ConditionsCommon conditions under which a specimen will be rejected.
Specimen submitted in gel-barrier tube.
RemarksAdditional specimen collection, transport, or test submission information.
StabilityAcceptable times/temperatures for specimens. Times include storage and transport time to ARUP.
Quantitative Equilibrium Dialysis (ED)/High Performance Liquid Chromatography-Tandem Mass Spectrometry
Performed
Days of the week the test is performed.
Varies
Reported
Expected turnaround time for a result, beginning when ARUP has received the specimen.
8-14 days
Reference Interval
Normal range/expected value(s) for a specific disease state. May also include abnormal ranges.
By report
Interpretive Data
May include disease information, patient result explanation, recommendations, or details of testing.
Compliance Category
Performed by non-ARUP Laboratory
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.
Triiodothyronine, Free (FT3)
Triiodothyronine (T3), Free by Equilibrium Dialysis/LC-MS/MS
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