what was the name of the lab test that patient 12274 received first?
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 = 12274 ) order by labevents.charttime asc limit 1 )