count the number of times that patient 30460 has received a transitional epithelial cells lab test in the previous year.
select count(*) from labevents where labevents.itemid in ( select d_labitems.itemid from d_labitems where d_labitems.label = 'transitional epithelial cells' ) and labevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 30460 ) and datetime(labevents.charttime,'start of year') = datetime(current_time,'start of year','-1 year')