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Family Physician
Family Physician, Board Certified MRO
Category: Drug Testing
Satisfied Customers: 12816
Experience:  Medical Review Officer - Physician Trained and certified in drug test interpretation
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How does human urine stay fresh for a drug screen? should it

Customer Question

how long does human urine stay fresh for a drug screen? should it be stored in the refrigerator? Is it ok to put on car heater to warm up?
Submitted: 6 years ago.
Category: Drug Testing
Expert:  DrRussMd replied 6 years ago.
It can typically be stored for up to 48 hours according to most protocols, preferably 24 hours.
In the refrigerator.
Good luck
let me know if you have further questions

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Expert:  Family Physician replied 6 years ago.
Standard drug testing collection procedure include measuring the temperature immediately upon collection.

If you are considering using someone else's urine or storing urine for later drug testing, you should be aware that MANY donors are caught while attempting to substitute urine, and this is treated exactly the same as a positive test.

Substituting or tampering with a drug test could also lead to legal problems if this is done during a drug test used for legal, employment or regulated drug testing (such as DOT or federal employee)