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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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Can you freeze clean urine for drug test and how long

Resolved Question:

can you freeze clean urine for drug test and how long
Submitted: 5 years ago.
Category: Drug Testing
Expert:  Family Physician replied 5 years ago.
Freezing urine does not impact the results of urine tests.

HOWEVER, if you are considering trying to substitute frozen urine for a drug test - this could result in a number of negative consequences. If discovered, you could face criminal charges, loss of job etc, since a substituted specimen is treated the same as a positive.
Family Physician and other Drug Testing Specialists are ready to help you
Customer: replied 5 years ago.
for how long
Expert:  Family Physician replied 5 years ago.
Long storage, keeping the specimen about -20 degrees celcius (-4 degrees F) can reduce the level of creatinine - which could result in the specimen being reported as dilute or substituted.