Just to let you know that we have adapted some of the checks on the DVR following some of your feedback.

- we have made the ‘impossible PaO2 for the reported FiO2′ check confirmable. It still remains impossible to have a PaO2 of 50 if you have only an FiO2 of 0.21 but if this is what is documented then please confirm this. We will of course remove these impossible values before using them in any analysis.

- the high pulse pressure check now will only fire if the difference between systolic and diastolic is >120mmHg rather than 100mmHg

- Isolated measurements of sodium will no longer trigger a request to check for missing values of urea and creatinine. Previously we had assumed that sodium would be most commonly measured with a laboratory U&E request and therefore it would be odd if creatinine was not reported. However since blood gas machines now frequently report sodium then we have removed the check.