tell me the last test that patient 29806 had received on their first hospital visit?
select d_labitems.label from d_labitems where d_labitems.itemid in ( select labevents.itemid from labevents where labevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 29806 and admissions.dischtime is not null order by admissions.admittime asc limit 1 ) order by labevents.charttime desc limit 1 )