has since 07/2104 patient 18678 been tested for hematocrit, ascites?
select count(*)>0 from labevents where labevents.itemid in ( select d_labitems.itemid from d_labitems where d_labitems.label = 'hematocrit, ascites' ) and labevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 18678 ) and strftime('%y-%m',labevents.charttime) >= '2104-07'