MRCP2-2012

MRCP2-2012

A 50-year-old woman presents to gastroenterology with a six-month history of chronic diarrhoea, bloating, flatulence, and occasional abdominal pain. She has a medical history of limited systemic sclerosis but takes no regular medications and has not recently used antibiotics. On examination, she has mild skin thickening on her hands, and her abdominal exam is unremarkable. Her lab results show a hemoglobin level of 122 g/L, platelets of 189 * 109/L, WBC of 4.2 * 109/L, Na+ of 137 mmol/L, K+ of 4.2 mmol/L, urea of 5.2 mmol/L, creatinine of 88 µmol/L, and CRP of 4 mg/L (< 5). What is the most appropriate diagnostic test for her likely diagnosis?