on their first hospital encounter, what specimen test did patient 94122 receive for the first time?
select microbiologyevents.spec_type_desc from microbiologyevents where microbiologyevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 94122 and admissions.dischtime is not null order by admissions.admittime asc limit 1 ) order by microbiologyevents.charttime asc limit 1