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Test ID T4 T4 (Thyroxine), Total Only, Serum

Useful For

Monitoring treatment with synthetic hormones (synthetic triiodothyronine will cause a low total thyroxine: T4)

 

Monitoring treatment of hyperthyroidism with thiouracil and other antithyroid drugs

Method Name

Electrochemiluminescence Immunoassay

Reporting Name

T4 (Thyroxine), Total Only, S

Specimen Type

Serum

Specimen Required

Patient Preparation: For 12 hours before this blood test do not take multivitamins or dietary supplements containing biotin (vitamin B7), which is commonly found in hair, skin, and nail supplements and multivitamins.

Collection Container/Tube:

Preferred: Serum gel

Acceptable: Red top

Submission Container/Tube: Plastic vial

Specimen Volume: 1 mL

Specimen Minimum Volume

0.5 mL

Specimen Stability Information

Specimen Type Temperature Time
Serum Refrigerated (preferred) 7 days
  Frozen  30 days

Reference Values

Adult (≥20 years): 4.5-11.7 mcg/dL

Pediatric:

0-5 days: 5.0-18.5 mcg/dL

6 days-2 months: 5.4-17.0 mcg/dL

3-11 months: 5.7-16.0 mcg/dL

1-5 years: 6.0-14.7 mcg/dL

6-10 years: 6.0-13.8 mcg/dL

11-19 years: 5.9-13.2 mcg/dL

Day(s) and Time(s) Performed

Monday through Friday 5 a.m. – 12 a.m., Saturday 6 a.m. – 6 p.m.

Performing Laboratory

Mayo Medical Laboratories in Rochester

CPT Code Information

84436

LOINC Code Information

Test ID Test Order Name Order LOINC Value
T4 T4 (Thyroxine), Total Only, S 3026-2

 

Result ID Test Result Name Result LOINC Value
T4 T4 (Thyroxine), Total Only, S 3026-2

Test Classification

This 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.

Testing Algorithm

See Thyroid Function Ordering Algorithm in Special Instructions.

Forms

If not ordering electronically, complete, print, and send a Neurology Specialty Testing Client Test Request (T732) with the specimen (http://www.mayomedicallaboratories.com/it-mmfiles/neurology-request-form.pdf)