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27th February 2025
A 56-year-old woman with a significant smoking history is investigated for abdominal pain and constipation.
A 56-year-old woman with a significant smoking history is investigated for abdominal pain and constipation. She is otherwise well. As part of her workup, she has a routine set of bloods which reveal the following:
| Haemoglobin | 121 g/L | 135-180 g/L |
| Platelets | 235 x 109/L | 150-400 x 109/L |
| White cell count | 4.5 x 109/L | 4.0-11.0 x 109/L |
| Sodium | 135 mmol/L | 135-145 mmol/L |
| Potassium | 4.2 mmol/L | 3.5-5.3 mmol/L |
| Urea | 4.1 mmol/L | 2.5-6.7 mmol/L |
| Creatinine | 84 μmol/L | 70-100 μmol/L |
| Corrected calcium | 2.84 mmol/L | 2.12-2.60 mmol/L |
| Phosphate | 0.67 mmol/L | 0.80-1.40 mmol/L |
| PTH | 6.0 pmol/L | 1.9-6.9 pmol/L |
What is the next most important investigation to undertake?
Select the SINGLE most appropriate option from the list below. Select ONE option only.
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