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There are single-sample tests and split-sample tests. If you've got a split-sample test, the second half of the sample goes into the freezer for six months regardless. For single-sample and the other part of a split-sample test, they retain the sample if it tests positive, but if it tests negative they normally dump it.

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Q: Do labs keep urine after they test it?
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Related questions

What is the name for people who test urine?

People who test urine are called "lab technicians." Urine is sent to medical labs, where it's tested by people who also run tests ordered by doctors to diagnose diseases.


Will qcarbo 32 block drugs from your urine?

I can't be dedected by a stick test, but it could in a lad test. It has creatine in it and some labs now, especially if it's for probation, test for that to see if you used a urine cleaner.


Can you tell if someone smokes through urine test?

Nicotine does show in urine tests, but most labs do not look for it being a legal non-intoxicant.


How many hours after the results of a failed drug test until its invalid?

some labs keep the urine frozen for up to one year but say it depends on what drug their tesetng for. They can keep it in the fridge for 1 week before it is discarded.


If you drink 1 gallon of water and then have a urine test in the nest 48 hours will you pass?

This is not a guaranteed method . Drinking water will dilute your sample possible allowing it to dive below the level you need to get to pass the test. It will also cause your urine to become very clear and labs will be able to tell that you have been trying to flush your system. Labs check for gravity, pH, creatin levels, etc (home test can not) so if you diluted your urine you can pass a home test , but not a Lab (will show dilution which is just like failing the test).


How long can you keep urine for pregnancy test?

yes you can store urine I did it for four hours and then used a pregnancy test and my results were positive and accurate


Will adderral and meth have a difference in urine test?

No. They will both set off the amphetamines test. Technically, you could see exactly what amphetamine compound it is by GC/MS, but even labs don't do that test unless asked to.


Can probation urine drug screens tell whether the urine is male or female?

Some labs do and some labs don't. To be safe, I would assume that they do. It is very easy to distinguish male urine from female urine.


Does it matter what women provides you urine to use in drug test?

No. Labs can tell the difference between men and women's urine because of the hormones in them.


Where do you keep clean urine in case you have to take a drug test And how do you keep it warm?

I recommend gargling with it.


How do you know about pregnancy in urine test in lab?

When a human female is pregnant, she starts to generate a hormone called hCG (human choriogonadotropin). It is specific to a pregnant female as it is made in the placenta, and it is excreted in the urine. Most labs will run an hCG test on all urine samples as part of the standard urinalysis.


How long can you keep urine in the refrigerator for pregnancy test?

about 3 to 9 days