familial primary hypomagnesemia with normocalcuria (MONDO_0017626, a Monarch Disease Ontology identifier) (FPHN) is a form of familial primary hypomagnesemia (FPH) which is characterized by low magnesium values but normal calcium values in the serum. The disorder consists of three distinct forms which are: autosomal recessive primary hypomagnesemia with normocalcuria and hypocalcemia (ARPHN), familial primary hypomagnesemia with normocalcuria and normocalcemia (FPHNN) and isolated autosomal dominant hypomagnesemia, Glaudemans type.