Given the high dose of diuretic medication, a check of urea and electrolytes is indicated.

Na 132 mmol/L (normal range 134-146 mmol/L)
K 3.4 mmol/L (normal range 3.4-5.0 mmol/L)
Urea 9 mmol/L (normal range 3.0-8.0 mmol/L)
Cr 130 µmol/L (normal range 50-95 µmol/L for adult females)