Yes, of course. A better question would be why would you care as long as you're not planning on drinking it.
Urine for a drug test must be fresh. The tester will refuse a sample you bring in already done, because it could be anyone's.
It depends on the environmental conditions but it starts becoming foul as soon as it leaves the body as the various chemicals separate and yeasts and bacteria start to break it down. Certainly within a few hours in warm conditions it will start to evaporate ammonia. The remaining liquid then continues to evaporate which leaves a powder residue which is mostly phosphorus and salts.
Urine can become a health hazard if left in a bottle for more than 24 hours, as bacteria can multiply and potentially cause infections. It is best to dispose of urine properly and not store it in a bottle for an extended period of time.
Urine can start to degrade and become unsafe in a bottle after about 24 hours due to the growth of bacteria. It is recommended to dispose of urine within this time frame to avoid potential health risks.
After opening and heating once how long does synthetic urine last
30 minutes
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.
standard urine screens do not test for soma, as it is not a narcotic. (but it does get you high, stay awake lol)
30-60 days
Immediately in blood. Within 5 minutes in urine.
Frozen urine can typically be stored for up to 6 months before it becomes unusable for testing or analysis.
depends if your a pokemon
No.