While a definitive addiction diagnosis often occurs after being evaluated by an addiction counselor, psychologist or psychiatrist, the first step usually starts with a family doctor. Blood tests, while often used to determine use a particular substance in the recent past, are not used to actually diagnose addiction.
Drug dependence behaviors and symptoms usually include:
Drug tests on urine and blood samples can reveal the amount of drugs and chemicals in the human body. However, the test’s sensitivity will depend on the drugs themselves, when the drugs were taken, and the quality of the testing laboratory. Also, even though urine screens are more commonly used for drug tests, blood tests tend to be more efficient at finding drugs.
Narcotics and opiates usually stay in the urine up to 36 hours, though this will ultimately depend on how often and how much of the drugs were used.
CNS stimulants like cocaine usually stay in the urine up to 12 days, though this will also depend on how often they were used.
CNS depressants like Xanax and Valium can be found up to a week after their last use and will mostly depend on which drugs were used and how fast the body was able to remove them.
The majority of hallucinogens out there also stay in the urine for up to a week after their last use, but marijuana – if taken regularly – can stay in the urine for up to a month after its last use.