ULTRASENSITIVE TSH (THYROID STIMULATING HORMONE): Evaluates anterior pituitary feedback regulation to detect subclinical and overt thyroid dysfunctions, serving as the front-line marker for metabolic irregularities.

FREE TRIIODOTHYRONINE (FT3): Quantifies unbound, biologically active T3 circulating in the bloodstream, providing an accurate measure of cellular thyroid hormone action unaffected by binding-protein shifts.

FREE THYROXINE (FT4): Assesses active, unbound circulating thyroxine to determine baseline thyroid gland output, diagnose thyrotoxicosis, and evaluate peripheral hormone availability.

TOTAL T3 & TOTAL T4 (OPTIONAL / EXTENDED PROFILE): Measures total circulating reservoir levels (protein-bound and unbound) to assess thyroid-binding globulin variations and baseline gland synthetic capacity.