what specimen test was given for the last time to patient 16088 on the first hospital visit?
select microbiologyevents.spec_type_desc from microbiologyevents where microbiologyevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 16088 and admissions.dischtime is not null order by admissions.admittime asc limit 1 ) order by microbiologyevents.charttime desc limit 1