Calcium and Phosphorus (Ca/P)

Calcium and phosphorus are essential minerals that serve as the primary structural components of the skeletal system, primarily in the form of hydroxyapatite crystals. Calcium is a critical secondary messenger in intracellular signaling, facilitating muscle contraction, neurotransmitter release, and blood coagulation (StatPearls, 2023). Phosphorus is a vital component of nucleic acids, phospholipids, and high-energy phosphates like ATP, playing a central role in cellular energy metabolism (NIH, 2023). The homeostasis of these minerals is tightly regulated by a complex network involving parathyroid hormone (PTH), calcitriol (active vitamin D), and fibroblast growth factor 23 (FGF23) (KDIGO, 2017). Dysregulation of this balance, often seen in chronic kidney disease, leads to mineral and bone disorder (CKD-MBD), characterized by bone fragility and extraskeletal calcification (Nature Reviews Nephrology, 2020). While not a single molecular target, pharmacological management involves using phosphate binders to limit absorption or calcimimetics and vitamin D analogs to modulate the regulatory hormones (Journal of the American Society of Nephrology, 2016).

Other names

Calcium and PhosphateMineral metabolismCalcium-phosphate homeostasisCa-P productSerum mineralsCalcium-phosphorus axis

Therapeutic strategies focus on maintaining mineral homeostasis through the use of phosphate binders that sequester dietary phosphate in the gastrointestinal tract, and the use of vitamin D analogs or calcimimetics to regulate the hormonal axes (PTH/FGF23) that control systemic calcium and phosphorus levels (StatPearls, 2023; KDIGO, 2017).