THYROID STIMULATING HORMONE (TSH / ULTRASENSITIVE): Pituitary-derived regulatory hormone and primary front-line screening marker for detecting subclinical and overt thyroid dysfunction, metabolic sluggishness, or pituitary axis imbalances.

TOTAL TRIIODOTHYRONINE (TOTAL T3): Evaluates overall circulating concentrations of the most metabolically active thyroid hormone, essential in confirming hyperthyroidism and peripheral conversion efficiency.

TOTAL THYROXINE (TOTAL T4): Measures total circulating levels of the primary hormone synthesized by the thyroid gland, providing insight into thyroid hormone production capacity and binding protein alterations.

FREE T3 & FREE T4 (OPTIONAL / REFLEX TESTING): Quantifies unbound, biologically active hormone fractions that interact directly with peripheral tissues, unaffected by alterations in thyroid-binding globulin (TBG) levels.