Thyroid - Thyroid Stimulating Hormone (TSH), µIU/mL 0.7 - 6.4 CMIA Serum 1.423 Clinical significance: In primary hypothyroidism, TSH (thyroid-stimulating hormone) levels will be elevated. In primary hyperthyroidism, TSH levels will be low. TSH estimation is especially useful in the differential diagnosis of primary (thyroid) from secondary (pituitary) and tertiary (hypothalamus) hypothyroidism. In primary hypothyroidism, TSH levels are significantly elevated, while in secondary and tertiary hypothyroidism, TSH levels are low or normal. Elevated or low TSH in the context of normal free thyroxine is often referred to as subclinical hypo- or hyperthyroidism, respectively. Pregnancy American Thyroid American European Thyroid society Association Endocrine Association 1st trimester < 2.5 < 2.5 < 2.5 2nd trimester < 3.0 < 3.0 < 3.0 3rd trimester < 3.5 < 3.0 < 3.0 Parameter Result Unit Biological Ref. Interval Method ------------------ End Of Report