instruction: when did patient 035-6788 receive the last test of a lab?
response: SELECT lab.labresulttime FROM lab WHERE lab.patientunitstayid IN (SELECT patient.patientunitstayid FROM patient WHERE patient.patienthealthsystemstayid IN (SELECT patient.patienthealthsystemstayid FROM patient WHERE patient.uniquepid = '035-6788')) ORDER BY lab.labresulttime DESC LIMIT 1