was there a phosphate test done on patient 9833 until 73 months ago?
select count(*)>0 from labevents where labevents.itemid in ( select d_labitems.itemid from d_labitems where d_labitems.label = 'phosphate' ) and labevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 9833 ) and datetime(labevents.charttime) <= datetime(current_time,'-73 month')