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2 weeks
30 min
If properly sealed and stored, urine samples are good for testing up to 24 hours after the sample given. The urine sample should be in a sterile container within a sealed plastic bag and stored in a refrigerator.
Quest Diagnostic does drug testing for many employers. After the sample is taken and sent for analysis, a doctor must check it. If the sample is positive for drugs, the doctor contacts the employee or potential employee before releasing results to the employer. Results are received in one to two weeks after testing.
30 minutes
1 hour at R.T. and 24 hrs. in refrigerator.
More than likely, if it was positive when given, it will stay positive even after 4 weeks. I am not sure how long the lab keeps your urine, but most don't take that long before testing.
It's not good anymore for testing once cold, it has to be fresh warm urine for the test to work properly.
Before long, the lion had eaten the gazelle. That's a simple one there are plenty of others that are far more elaborate and formal.
it should be done as soon as possible,but if delay it should be kept in refrigerated, it can be stored for 24 hrs.
about 9 months
It depends on the testing method. You have to ask your testing center.Latest advanced testing methods needs a period of 60 days.