Monarch Disease Ontology entry MONDO_0024300 (hypophosphatemic rickets) is rickets due to low serum phosphate concentrations, the cause of which can be nutritional or genetic. This condition is characterized by normal parathyroid hormone concentrations, usually caused by renal phosphate wasting occurring in isolation or as part of a renal tubular disorder, and characterized by resistance to treatment with ultraviolet radiation or vitamin D. Also known as: Phosphopenic rickets.