July 2017: Recommendation 1.3.4 was stood down as it has been superseded by newly-published NICE diagnostics guidance on quantitative faecal immunochemical tests to guide referral for colorectal cancer in primary care. Recommendation 1.3.1 was amended to remove a link to recommendation 1.3.4.
June 2016: Recommendations 1.3.1 and 1.3.2 have been changed to say 'adults' instead of 'people' to more accurately reflect the populations they cover.
July 2015: Guideline Development Group and declarations of interest amended.
June 2015: This guideline updates and replaces NICE guideline CG27 (published June 2005). Recommendations 1.1.1 to 1.1.3 update and replace recommendations 1.1.2 to 1.1.5 for referral and indications for chest radiography from lung cancer, NICE guideline CG121 (published April 2011).
Recommendations are marked as [new 2015], ,  or :
Some recommendations can be made with more certainty than others. The Guideline Development Group makes a recommendation based on the trade‑off between the benefits and harms of an intervention, taking into account the quality of the underpinning evidence. For some interventions, the Guideline Development Group is confident that, given the information it has looked at, most patients would choose the intervention. The wording used in the recommendations in this guideline denotes the certainty with which the recommendation is made (the strength of the recommendation).
For all recommendations, NICE expects that there is discussion with the patient about the risks and benefits of the interventions, and their values and preferences. This discussion aims to help them to reach a fully informed decision (see also patient-centred care).
We usually use 'must' or 'must not' only if there is a legal duty to apply the recommendation. Occasionally we use 'must' (or 'must not') if the consequences of not following the recommendation could be extremely serious or potentially life threatening.
We use 'offer' (and similar words such as 'refer' or 'advise') when we are confident that, for the vast majority of patients, an intervention will do more good than harm, and be cost effective. We use similar forms of words (for example, 'Do not offer…') when we are confident that an intervention will not be of benefit for most patients.
We use 'consider' when we are confident that an intervention will do more good than harm for most patients, and be cost effective, but other options may be similarly cost effective. The choice of intervention, and whether or not to have the intervention at all, is more likely to depend on the patient's values and preferences than for a strong recommendation, and so the healthcare professional should spend more time considering and discussing the options with the patient.
NICE began using this approach to denote the strength of recommendations in guidelines that started development after publication of the 2009 version of 'The guidelines manual' (January 2009). This does not apply to any recommendations ending  (see update information for details about how recommendations are labelled). In particular, for recommendations labelled  the word 'consider' may not necessarily be used to denote the strength of the recommendation.