has patient 26612 received until 2104 a test for anion gap?
select count(*)>0 from labevents where labevents.itemid in ( select d_labitems.itemid from d_labitems where d_labitems.label = 'anion gap' ) and labevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 26612 ) and strftime('%y',labevents.charttime) <= '2104'