GSTM1 and Hyponatremia: Initial laboratory investigations on admission demonstrated severe hyponatremia (106 mmol/L), mild hyperkalemia (5.6 mmol/L), hypoglycemia (3.1 mmol/L), and normocytic anaemia (Hb 82 g/L on admission, falling to a nadir of 69 g/L during hospitalisation; prior Hb 70-80 g/L in March 2025).