Urinary calcium ions

"Urinary calcium ions" refers to the **amount of calcium ions (Ca2+) excreted in urine**, measured either over a 24-hour period, per unit time, or as a concentration in spot urine samples[5][4]. This is a *physiological output* regulated by kidney function, dietary calcium intake, bone metabolism, and hormones such as parathyroid hormone and vitamin D[7][3]. Calcium handling in the kidney involves filtration at the glomerulus and complex reabsorption in the proximal tubule, thick ascending limb, and distal convoluted tubule, mediated by various channels and transporters such as TRPV5, paracellular claudins, and regulated by calcitropic hormones[2][4][8]. Abnormal urinary calcium excretion (calciuria—either increased or decreased) is an important clinical biomarker for metabolic bone disease, nephrolithiasis, and endocrine disorders. It is not, however, a therapeutic target or molecular receptor but rather an endpoint measurement reflective of upstream molecular and physiological processes. Summary: “Urinary calcium ions” is a measurement, not a drug/protein target, so the entry is incorrect for use as a canonical molecular target. It serves as a clinical biomarker reflecting kidney function and systemic calcium regulation, but is not druggable itself[7][4][8].

Other names

CalciuriaUrinary Ca2+Urinary calcium excretion

Indirect modulation by drugs that influence renal tubular calcium reabsorption (e.g., thiazides enhance reabsorption via DCT; loop diuretics inhibit NKCC2, decreasing paracellular reabsorption and raising urinary excretion)[7][4]