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Lab Dept:
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Chemistry
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Test Name:
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T3 (TRIIODOTHYRONINE) TOTAL, SERUM
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General Information
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Lab Order Codes:
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TT3
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Synonyms:
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T3 RIA, T3R, Total T3, T3
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CPT Codes:
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84480 – Triiodothyronine T3; total (TT-3)
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Test Includes:
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T3 concentration reported in ng/mL.
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Logistics
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Test Indications:
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T3 (Triiodothyronine) is produced by the thyroid and secreted in response to TSH. T3 is physiologically more potent than T4. 99.7% of t3 is bound to protein and acts as a reserve for the metabolically active free T3. T3 blood levels are useful in assessing hyperthyroidism.
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Lab Testing Sections:
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Chemistry (all testing is performed on the St. Paul campus)
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Phone Numbers:
Minneapolis:
Saint Paul:
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612-813-6280
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651-220-6550
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Test Availability:
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Daily, 24 hours
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Turnaround Time:
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1 – 3 days, test performed Monday – Friday.
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Special Instructions:
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N/A
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Specimen
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Specimen Type:
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Blood
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Container:
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Red top (plain, no gel) tube
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Draw Volume:
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1.5 mL (Minimum: 0.6 mL) blood
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Processed Volume:
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0.5 mL (Minimum: 0.2 mL) serum
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Collection:
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Routine venipuncture
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Special Processing:
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Lab Staff: Centrifuge specimen, remove serum aliquot into a plastic sample cup. Store at refrigerated temperatures.
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Patient Preparation:
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None
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Sample Rejection:
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Mislabeled or unlabeled specimen; specimens other than serum; gross hemolysis
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Interpretive
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Reference Range:
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Age:
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Range (ng/mL):
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0 - 6 days:
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0.89 - 4.05 ng/mL
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7 days - 1 month:
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0.91 - 3.00 ng/mL
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1 month - 1 year:
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0.85 - 2.50 ng/mL
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1 - 10 years:
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1.19 - 2.18 ng/mL
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>10 years:
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0.55 - 1.70 ng/mL
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Critical Values:
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N/A
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Limitations:
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Heterophile antibodies may interfere with immunoassay testing.
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Methodology:
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Competitive Immunoassay/Chemiluminescence
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References:
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Diagnostic Products Corporation T3 Package Insert PIL2KT3-17 (07/29/2008)
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