the total number of times since 2102 patient 83709 has had a lab test for hemoglobin.
select count(*) from labevents where labevents.itemid in ( select d_labitems.itemid from d_labitems where d_labitems.label = 'hemoglobin' ) and labevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 83709 ) and strftime('%y',labevents.charttime) >= '2102'