Prevalence of inadequate requisitions by ACCF 2011 AUC indication category in (a) patients with a previous echocardiogram (n = 712) and (b) patients without a previous echocardiogram (n = 591). [Data are presented as a percentage of each indication category. The grey line depicts the prevalence in each population. * represents p < 0.001 when the prevalence in the individual subgroups are compared to that of the overall population]. ACHD, Adult Congenital Heart Disease; CM, Cardiomyopathy; CV, Cardiovascular; Gen. Eval., General Evaluation; HF, Heart Failure; Htn, Hypertension.