when was patient 16572 last tested until 11/2103 for chloride, whole blood?
select labevents.charttime from labevents where labevents.itemid in ( select d_labitems.itemid from d_labitems where d_labitems.label = 'chloride, whole blood' ) and labevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 16572 ) and strftime('%y-%m',labevents.charttime) <= '2103-11' order by labevents.charttime desc limit 1