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Boston Heart Free T3 Test

Boston HeartSKU: AFH-1017-I4-ICD
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Free T3 is the amount of T3 hormone that is freely circulating in the blood.

Full Description

Test Code 1017

Free T3 (Free Triiodothyronine or FT3)

Free T3 is the amount of T3 hormone that is freely circulating in the blood.

Methodology

Chemiluminescence immunoassay

Patient Preparation

None

Preferred Specimen

1.0 mL serum collected in a serum separator tube (SST / Tiger Top)

Alternate Specimen

1.0 mL plasma in an EDTA plasma separator tube (Pearl Top)

Transport Temperature

Refrigerated (ship on frozen cold packs)

Stability

Refrigerated: 7 days  (7 days on SST gel)

 

  • Low: <2.0 pg/mL
  • Optimal: 2.0-4.4 pg/mL
  • High: >4.4 pg/mL
  • Low Free T3 levels are consistent with hypothyroidism or inadequate thyroid hormone replacement.1-3
  • High Free T3 levels are consistent with either hyperthyroidism or excess thyroid hormone replacement.1-3
  • High doses of biotin (> 5 mg/day) may interfere with assay results. Patient assumed to be refraining from biotin supplementation for at least 3 days prior to blood draw.
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