What can contaminate a urine drug test?

Urine samples are sometimes contaminated deliberately by ingestion or addition of a foreign substance to prevent detection of illicit drugs. Common methods of tampering include dilution with water, addition of extraneous substances, or substitution of samples.

What happens if your pee is diluted on a drug test?

Diluted urine occurs when there’s too much water in the urine. It means the urine’s concentration is weak. As a result, the tester will be unable to properly detect the presence of drugs in the urine.

How can I get a false-negative on a drug test?

False-negatives can occur when the urine drug concentration is below the threshold level set by the laboratory performing the test. Dilute urine, the duration of time between ingestion of the drug and time of testing, and the quantity of the drug ingested may affect the occurrence of false-negatives.

What makes a home drug test invalid?

Invalid: An invalid result means that the test was not able to identify whether drugs were present in the sample. Invalid results may be reported for many reasons including evidence of tampering or adulteration that occurred during the collection process.

Can a diluted drug test still be positive?

Sometimes dilution is intentional, but it can happen accidentally as well. If the drug levels do not reach a certain cut-off point established by the laboratory, the specimen will not be marked positive for the drug even if it is detected.

How long is urine good for for a drug test?

Storing a urine sample Do not keep it for longer than 24 hours. The bacteria in the urine sample can multiply if it is not kept in a fridge. If this happens, it could affect the test results.

Is it okay if your pee is clear?

If a person experiences clear urine, they do not usually need to take any further action. Clear urine is a sign of good hydration and a healthy urinary tract. However, if they consistently notice clear urine and also have extreme or unusual thirst, it is best to speak to a doctor.

Can being dehydrated affect a urine test?

Dehydration can also skew drug testing results. Arriving to the drug testing site dehydrated can actually elevate results inaccurately. Since urine from a dehydrated person is much more concentrated, traces of certain prescriptions and over-the-counter medications can trigger a false positive.