What is Dilution
Dilute positive samples are still considered a failing drug test, so the best outcome you can hope for with dilution is that your sample will come back dilute negative. In this case it is likely that your employer will schedule another test, possibly to be performed under observation.
Dilution is commonly used in an effort to beat a drug test. This typically involves drinking excessive volumes of water prior to a drug test or even pouring water directly into the urine sample. The idea comes from knowing that if drug levels do not reach minimum levels set by the lab, the sample will not be marked positive, even if a drug is detected.
That idea is actually only partly accurate. First, labs know about dilution as a way to try to beat a drug test and they screen for it. Second, diluted urine does not simply get a pass / fail rating. Labs look at something called specific gravity first to determine whether a sample is dilute. If it is dilute, they still perform a drug screen, which can then be marked dilute positive or dilute negative. To show up as dilute negative, you would need to dilute any drug levels in a sample below the detection levels, not some arbitrary cutoff level.
Dilute positive samples are still considered a failing drug test, so the best outcome you can hope for with dilution is that your sample will come back dilute negative. In this case it is likely that your employer will schedule another test, possibly to be performed under observation. This is why dilution should never be considered a way to pass a drug test.
Can my sample be dilute even if I haven't done anything?
Perhaps you have undergone a drug screen and received a dilute negative result. This should not be grounds for termination, because there are legitimate reasons why your urine may be dilute. The most common reasons are that you consume a lot of fluids in your diet or as part of your exercise routine. It is also possible that your body produces lower levels of some of the chemicals labs use to detect dilution, such as creatinine levels.
If you receive an unexpected dilute sample result, the simplest thing you can do is to consume less fluid before taking the next test. Although it's unlikely natural chemicals in your body would cause a false positive, you may want to consider scheduling a blood test with your physician due to the long-term effects excessive fluid consumption can have on the body.
Although something as simple as drinking more water may seem pretty harmless, the massive quantities that must be consumed for effective dilution can present an actual medical risk. Drinking more than 27 ounces of water per hour can lead to a dangerous electrolyte imbalance in the body. You may have heard of water intoxication, which can lead to brain swelling, seizure, and even death. Consuming electolyte-enhanced fluids can reduce this risk, but the small chance of dilution working means the risk probably isn't worth it.