You are clerking a patient referred from the GP with a new diagnosis of hyponatraemia. | Medibuddy
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21st May 2025

You are clerking a patient referred from the GP with a new diagnosis of hyponatraemia.

You are clerking a patient referred from the GP with a new diagnosis of hyponatraemia. They are on no regular medications. Their serum sodium is 129, and they are clinically euvolaemic. You suspect that the underlying cause of their hyponatraemia is SIADH. 

Which of the following is least likely to cause SIADH?

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