what were the first creatine kinase (ck) from patient 96833 in the current hospital visit?
select labevents.valuenum from labevents where labevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 96833 and admissions.dischtime is null ) and labevents.itemid in ( select d_labitems.itemid from d_labitems where d_labitems.label = 'creatine kinase (ck)' ) order by labevents.charttime asc limit 1