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TSH with Reflex to Free T4

Total reviews 423

$57.00 $40.00

Total reviews 423


  • Tests Included: 1

  • Est. 3-5 (business days) Turnaround

  • Specimen type: Blood

  • Lab Location

For differential diagnosis of primary, secondary, and tertiary hypothyroidism. Also useful in screening for hyperthyroidism. This assay allows adjustment of exogenous thyroxine dosage in hypothyroid patients and in patients on suppressive thyroxine therapy for thyroid neoplasia.

$57.00 $40.00
  • Tests Included: 1

  • Est. 3-5 (business days) Turnaround

  • Specimen type: Blood

  • Lab Location

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For patients 1 year of age or older, Free T4 will be performed at an additional charge (CPT code(s): 84439) when TSH result exceeds age/gender specific reference range.

  • Test Code: 36127
  • CPT Code: 84443
  • Alternate Name: N/A
  • Test Instructions : Specimen collection after fluorescein dye angiography should be delayed for at least 3 days. For patients on hemodialysis, specimen collection should be delayed for 2 weeks. According to the assay manufacturer Siemens: "Samples containing fluorescein can produce falsely depressed values when tested with the Advia Centaur TSH3 Ultra assay."

    Please do not exercise prior to testing. It is best that your blood is taken in a rested state.

  • Fasting: No
  • Methodology: Immunoassay (IA)
  • Results In: 3-5

    Note: Turn around times on results are an estimate and are not guaranteed. The lab may need additional time due to holidays, confirmation/repeat testing, etc. You can contact us to discuss when your results should be ready and we will contact the lab on your behalf immediately.

  • Reflex: If this test receives a positive result then a confirmatory test/reflex will be carried out automatically.

Premature Infants (28-36 Weeks)  
  1st Week of Life 0.20-27.90 mIU/L
Term Infants (>37 Weeks)  
  Serum or Cord Blood 1.00-39.00 mIU/L
  1-2 Days 3.20-34.60 mIU/L
  3-4 Days 0.70-15.40 mIU/L
  5 Days-4 Weeks 1.70-9.10 mIU/L
  1-11 Months 0.80-8.20 mIU/L
  1-19 Years 0.50-4.30 mIU/L
  ≥20 Years 0.40-4.50 mIU/L
Pregnancy  
  First Trimester 0.26-2.66 mIU/L
  Second Trimester 0.55-2.73 mIU/L
  Third Trimester 0.43-2.91 mIU/L
$57.00 $40.00

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