Preferred Specimen(s) 1 mL serum
Transport Container Plastic screw-cap vial
Transport Temperature
- Ambient 4 days,
- Refrigerated 30 days
Methodology Chemiluminescence
Clinical Significance: For differential diagnosis of primary, secondary, and tertiary hypothyroidism. This assay is a third generation product capable of detecting values as low as 0.01 mIU/L. The test is 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