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HelpTest Code T3 T3
Additional Codes
Epic: LAB136
Specimen Required
Collection Container/Type
Preferred: Serum gel
Acceptable: Green top (Lithium heparin)
Submission Container/Tube: Plastic vial
Specimen Volume: 3.0 mL
Collection Instructions: Centrifuge and separate cells after clot formation and within 4 hours of collection. Remove serum if testing will be delayed more than 24 hours.
Specimen Minimum Volume
0.5 mL
Specimen Stability
Room Temperature: Unacceptable
Refrigerated (on gel): 24 hours
Refrigerated (off gel): 6 days
Frozen: >6 days
Reference Range
0.58 - 1.59 ng/mL
Rejection Due To
Samples stored on gel >24 hours, unlabeled, mislabeled, wrong tube type, hemolyzed, QNS, exceeds specimen stability requirements.
Report Available
Same day
Clinical Significance
Triiodothyronine (T3) is a thyroid hormone with a half-life in serum of 1.5 days. T3 circulates in the blood as an equilibrium mixture of free and protein bound hormone. It has become apparent in recent years that T3 plays an important role in the maintenance of the euthyroid state. Serum T3 can be a component of thyroid screening panels in diagnosing certain disorders of thyroid function, particularly hyperthyroidism and conditions caused by iodine deficiency. Slightly elevated T3 may occur in pregnancy and during estrogen therapy, while depressed levels may occur during severe illness, malnutrition, in renal failure and during therapy with anti-thyroid drugs.
Method Name
Chemiluminescent microparticle immunoassay (CMIA)
Limitations
For diagnostic purposes, results should be used in conjunction with other data: symptoms, results of other thyroid tests, clinical impressions, etc.
The ARCHITECT Total T3 assay is designed to have a mean potential interference from hemoglobin, bilirubin, triglycerides, and protein of <10% at :
Hemoglobin ≤ 500 mg/dL
Bilirubin ≤20 mg/dL
Triglycerides ≤ 2000 mg/dL
Protein ≤ 12 g/dL
LOINC
3053-6
Day(s) Performed
Daily