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Table 2 Class of recommendations

From: Role of cardiovascular magnetic resonance in the guidelines of the European Society of Cardiology

Class of recommendation Definition Suggested wording to use
Class I Evidence and/or general agreement that a given treatment or procedure is beneficial, useful, effective. Is recommended/is indicated
Class II Conflicting evidence and/or a divergence of opinion about the usefulness/efficacy of the given treatment or procedure.  
Class IIa Weight of evidence/opinion is in favour of usefulness/efficacy. Should be considered
Class IIb Usefulness/efficacy is less well established by evidence/opinion. May be considered
Class III Evidence or general agreement that the given treatment or procedure is not useful/effective, and in some cases may be harmful. Is not recommended