A 30-year-old female patient with uncontrolled hypertension is suspected by an investi- gating endocrinologist of having Conn's syndrome. Results of routine biochemistry were (reference ranges are given in brackets): Sodium Potassium Urea Creatinine Alkaline phosphatase Alanine aminotransferase Albumin Bilirubin Calcium 146 mmol/L 2.1 mmol/L 7.2 mmol/L 146 μmol/L 290 IU/L 20 IU/L 49 g/L 8 μmol/L 2.19 mmol/L (135-145) (3.5-5.0) (3.5-6.6) (70-150) (95-320) (5-42) (35-50) (<17) (2.12-2.62) (a) Are any of the electrolyte concentrations abnormal, and if so what condition is suggested? (b) What further biochemistry investigations would you undertake? Explain your reasoning.

A 30-year-old female patient with uncontrolled hypertension is suspected by an investi- gating endocrinologist of having Conn's syndrome. Results of routine biochemistry were (reference ranges are given in brackets): Sodium Potassium Urea Creatinine Alkaline phosphatase Alanine aminotransferase Albumin Bilirubin Calcium 146 mmol/L 2.1 mmol/L 7.2 mmol/L 146 μmol/L 290 IU/L 20 IU/L 49 g/L 8 μmol/L 2.19 mmol/L (135-145) (3.5-5.0) (3.5-6.6) (70-150) (95-320) (5-42) (35-50) (<17) (2.12-2.62) (a) Are any of the electrolyte concentrations abnormal, and if so what condition is suggested? (b) What further biochemistry investigations would you undertake? Explain your reasoning.