• Full blood count
• Plasma sodium, potassium, urea and creatinine with eGFR
• Uncuffed sample for plasma calcium, phosphate, magnesium, total protein, albumin, alkaline phosphatase
• Chest X-ray
• ECG

If the cause of hypercalcaemia is not known:

• Serum and urine protein electrophoresis
• Parathyroid hormone (PTH)
• Parathyroid hormone related protein (PTH related hormone is very rarely required and is offered by few laboratories)
• C-reactive protein and ESR
• Thyroid function tests
• Vitamin D (25-hydroxy vitamin D)
• Urine calcium concentration