Quote Originally Posted by Burnt Toast
That would depend on how much time you have until your scheduled U/A. Human urine can be microwaved, but I generally dont recommend it because human urine is bio-hazardous and should not be in an area where food/utensils are involved.
If you know ahead of time, defrost in fridge 24 hours prior to use. Burnt Toast said something I didn't think to mention. The microwave......I have used a tiny office like one I have in my basement. I personally didn't want to mix drug testing urine around my food areas. Another option is to place in a cup of boiled water for about a minute.