Active Vitamin D Test - Active Vitamin D (1,25-Dihydroxyvitamin D) Test

A specific, quantitative endocrine assay measuring the exact serum concentration of 1,25-Dihydroxycholecalciferol (Calcitriol). This distinct chemical structure constitutes the fully biologically active, steroidal hormonal form of Vitamin D synthesized via the kidneys. Clinically, determining this exact concentration serves as a highly precise, direct biological indicator reflecting the actual physiological and metabolic activity level of Vitamin D within the patient's system, particularly concerning calcium homeostasis and bone metabolism.