Letters Diagnosing hyponatraemia

Urine tests are often unhelpful

BMJ 2007; 334 doi: https://doi.org/10.1136/bmj.39150.453854.BE (Published 15 March 2007) Cite this as: BMJ 2007;334:550
  1. Mat Davies, consultant nephrologist (mat.davies@cardiffandvale.wales.nhs.uk)
  1. University Hospital of Wales, Cardiff CF14 4XW

    In their discussion of the management of hyponatraemia in primary care, Smellie and Heald correctly emphasise the importance of investigating sudden changes in serum sodium, but the investigational strategy they advocate is incorrect.1 Firstly, they advocate submitting a sample for …

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