The timetable for detecting methadone in the system is also dependent upon each individual's metabolism, body mass, age, hydration level, physical activity, health conditions and other factors, making it almost impossible to determine an exact time methadone will show up on a drug test.
Methadone Drug Tests TimetableThe following is an estimated range of times, or detection windows, during which methadone can be detected by various testing methods:
Urine Test: 6-12 days
Blood Test: 24 hrs`
Saliva Test: 1-10 days
Methadone, like like many other drugs, can be detected with a hair follicle drug test for up to 90 days.
American Association for Clinical Chemistry "Drugs of Abuse Testing." Lab Tests Online. Revised 2 January 2013.
LabCorp, Inc. "Drugs of Abuse Reference Guide." Accessed March 2013.
OHS Health & Safety Services. "How long do drugs stay in your system - including alcohol?." Accessed March 2013.