Laboratory results at this visit included serum mag ium mgldL(0.21 mmol/L) [reference interval 0.2 2.4 bat ldL do 1.0 mmol/L)] and serum calcium 6.asing/dL(Rivmmol/L) [reference interval 8.8-10.6 nglAL 02.20-2.65 mmol/L)]. Serum albumin was 35 g/L(reference interval 35-52 g/L The results of her sdieR biochemical tests were unremarkable. Twenty- foukhour urine magnesium excretion was undetectable[reference interval 0.5-1.2 mgldL(0.2-5.0 mmol/24 as was random urine esium(