MRCP2-1490

A 25-year-old woman with a history of anorexia presents to her primary care physician with vomiting and stomach discomfort.
Investigations:

Urea 18 mmol/l 2.5–6.5 mmol/l
Creatinine (Cr) 90 µmol/l 50–120 µmol/l
Sodium (Na+) 142 mmol/l 135–145 mmol/l
Potassium (K+) 3.8 mmol/l 3.5–5.0 mmol/l
Corrected calcium (Ca2+) 3.5 mmol/l 2.2–2.6 mmol/l
Plasma parathyroid hormone (PTH) 8.5 pmol/l 0.9–5.4 mmol/l
Initiation of fluid resuscitation with 0.9% sodium chloride is commenced.
What would be the subsequent step in management after fluid resuscitation?