The accuracy of the general practitioner’s sense of alarm when confronted with dyspnoea and/or thoracic pain: protocol for a prospective observational study, published in the BMJ Open (see http://bmjopen.bmj.com/content/5/3/e006810.long) (Marie Barais et al).

The sensitivity, the specificity, the positive and negative likelihood ratio of the sense of alarm will be calculated from a constructed contingency table.