have patient 25523's been tested since 04/2102 for human chorionic gonadotropin?
select count(*)>0 from labevents where labevents.itemid in ( select d_labitems.itemid from d_labitems where d_labitems.label = 'human chorionic gonadotropin' ) and labevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 25523 ) and strftime('%y-%m',labevents.charttime) >= '2102-04'