Test ID T3 T3 (Triiodothyronine), Total, Serum
Second-order testing for hyperthyroidism in patients with low thyroid stimulating hormone values and normal T4 levels
Diagnosis of T3 toxicosis
See Thyroid Function Ordering Algorithm in Special Instructions.
Reporting NameT3 (Triiodothyronine), Total, S
Preferred: Serum gel
Acceptable: Red top
Specimen Volume: 0.6 mL
Specimen Minimum Volume0.5 mL
Specimen Stability Information
|Serum||Refrigerated (preferred)||7 days|
≥1 year: 80-190 ng/dL
Day(s) and Time(s) Performed
Monday through Friday 5 a.m. – 12 a.m., Saturday 6 a.m. – 6 p.m.
Performing LaboratoryMayo Medical Laboratories in Rochester
Test ClassificationThis test has been cleared or approved by the U.S. Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.
CPT Code Information
LOINC Code Information
|Result ID||Reporting Name||LOINC Code|
|T3||T3 (Triiodothyronine), Total, S||3053-6|