instruction: what lab test was given for the last time until 25 months ago to patient 012-40970?
response: SELECT lab.labname FROM lab WHERE lab.patientunitstayid IN (SELECT patient.patientunitstayid FROM patient WHERE patient.patienthealthsystemstayid IN (SELECT patient.patienthealthsystemstayid FROM patient WHERE patient.uniquepid = '012-40970')) AND DATETIME(lab.labresulttime) <= DATETIME(CURRENT_TIME(), '-25 month') ORDER BY lab.labresulttime DESC LIMIT 1