how many times did patient 18866 make a or urine out on the current icu visit?
select count(*) from outputevents where outputevents.icustay_id in ( select icustays.icustay_id from icustays where icustays.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 18866 ) and icustays.outtime is null ) and outputevents.itemid in ( select d_items.itemid from d_items where d_items.label = 'or urine' and d_items.linksto = 'outputevents' )