20th July 2023

A 57-year-old woman with a past medical history of gastro-oesophageal reflux disease (GORD)

A 57-year-old woman with a past medical history of gastro-oesophageal reflux disease (GORD), for which she takes omeprazole 40mg OD, presents to her GP with a 4-month history of abdominal bloating and intermittent diarrhoea. Her blood tests reveal deficiencies in a number of vitamins. Her GP, therefore, refers her to gastroenterology with a view to arranging lactulose hydrogen breath testing to investigate for possible SIBO.

Which of the following vitamins is most likely to be elevated on blood tests in this condition?

Select the SINGLE most appropriate option from the list below. Select ONE option only.