The timetable for detecting naltrexone 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 naltrexone will show up on a drug test.
Naltrexone Drug Tests TimetableThe following is an estimated range of times, or detection windows, during which naltrexone can be detected by various testing methods:
Urine Test: 4-6 hrs
Blood Test: N/A`
Saliva Test: 1 day
Naltrexone, 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.