did patient 15945 in 12/this year get an specific gravity lab test?
select count(*)>0 from labevents where labevents.itemid in ( select d_labitems.itemid from d_labitems where d_labitems.label = 'specific gravity' ) and labevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 15945 ) and datetime(labevents.charttime,'start of year') = datetime(current_time,'start of year','-0 year') and strftime('%m',labevents.charttime) = '12'