does any organism have been detected in the last bronchoalveolar lavage microbiology test of patient 18877 in the first hospital visit?
select count(*)>0 from microbiologyevents where microbiologyevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 18877 and admissions.dischtime is not null order by admissions.admittime asc limit 1 ) and microbiologyevents.spec_type_desc = 'bronchoalveolar lavage' and microbiologyevents.org_name is not null order by microbiologyevents.charttime desc limit 1