Thanks to Ian Hainsworth for suggesting this Case. A 75 year old man, seeing his Family Doctor. Clinical information is 'Parathyroidectomy 1997. Annual check'. Serum results are Sodium: 139 mmol/L (135 - 145) Potassium: 4.8 mmol/L (3.5 - 5.3) Bicarbonate: 13 mmol/L (20 - 35) Urea: 16.6 mmol/L (2.5 - 7.5) Creatinine: 428 umol/L (70 - 135) Adjusted calcium: 2.59 mmol/L (2.15 - 2.60) Phosphate: 1.2 mmol/L (0.8 - 1.4) Parathyroid hormone: 420 ug/L (<50) Comment (maximum 2 lines if possible please) to [log in to unmask], not to the mailbase. Best wishes Gordon Challand %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%