since 09/2104 has there been a urine microbiology test for patient 86791?
select count(*)>0 from microbiologyevents where microbiologyevents.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 86791 ) and microbiologyevents.spec_type_desc = 'urine' and strftime('%y-%m',microbiologyevents.charttime) >= '2104-09'