Drug testing how many days

Written By: Sprout Editorial Team. How long drugs stay in your system depends on many factors. How long drugs stay in your system can depend on many factors, including the substance, dosage, your metabolism, and even your tolerance. How long you can detect a drug in your system also depends on the test used and how it was performed.

How long you can detect a drug in your system depends on a host of factors. Here are some of the most common:. Although you often hear metabolism in reference to diet, in this case it means how efficiently your kidney and liver metabolize drugs. The more efficient these organs, the more quickly your body can process and eliminate drugs.

Age and metabolism are related. Generally speaking, the older you get, the less efficiently your kidney and liver can process drugs and alcohol. For this reason, you can expect drugs to linger in your system for longer as you age. In lipid-soluble drugs, like THC, the drug can bind to body fat, leading to a slower processing time.

Because women typically have a higher percentage of body fat than men, women may process lipid-soluble drugs more slowly than men. A long-time user of a particular drug will often test positive for a longer period of time than someone who just started using.

Different test types impact how long a drug can be detected, as indicated in the chart below. Tests that rely on blood or saliva typically have a much shorter window than urine. The type, amount, and frequency of the drug being taken, along with many other factors, determine how long it will stay in your system.

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Opioid Addiction. Alcohol Facts and Statistics. Confidentially speak with a treatment provider: Call Chat. Access to top treatment centers Caring, supportive guidance Financial assistance options. The length of time that a drug is detectable in the system depends on a variety of factors, including:. Drugs or their metabolites may be detectable in hair. Hair grows at a rate of approximately 1cm per month so depending on the length of hair it may be possible to determine drug use over recent months.

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