instruction: what was the name of the specimen test that patient 031-19622 received until 46 months ago first?
response: SELECT microlab.culturesite FROM microlab WHERE microlab.patientunitstayid IN (SELECT patient.patientunitstayid FROM patient WHERE patient.patienthealthsystemstayid IN (SELECT patient.patienthealthsystemstayid FROM patient WHERE patient.uniquepid = '031-19622')) AND DATETIME(microlab.culturetakentime) <= DATETIME(CURRENT_TIME(), '-46 month') ORDER BY microlab.culturetakentime LIMIT 1