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28th February 2025
A 49-year-old presents to the GP with generalised weakness and fatigue. He is known to have ulcerative colitis
A 49-year-old presents to the GP with generalised weakness and fatigue. He is known to have ulcerative colitis which is well controlled on oral aminosalicylate. His last colonoscopy a year ago showed extensive colitis with moderate inflammation. Recently he has been opening his bowels one or twice daily, with no rectal blood or black tarry stool. He has smoked 15 cigarettes daily for the past 20 years. He continues to work as a lecturer. Physical examination is unremarkable.
His blood results are given below:
| Hb | 90 g/L | (135 – 180) |
| MCV | 76 fL | (80 – 100) |
| WBC | 10.1 x 10⁹/L | (4.0 – 11.0) |
| Na+ | 136 mmol/L | (135 – 145) |
| K+ | 4.1 mmol/L | (3.5 – 5.0) |
| Urea | 5.0 mmol/L | (2.0 – 7.0) |
| Creatinine | 99 µmol/L | (55 – 120) |
Which of the following is the next best appropriate investigation?
Select the SINGLE most appropriate option from the list below. Select ONE option only.
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