Yes, you can. But it’s a slow death. Freezing at -20°C will preserve some components for months—especially for hormone or DNA testing. But the texture? It goes weird. Crystals form. Cells burst. When you thaw it, it looks like sediment soup.
If you must freeze urine (for science or strange hobbies), do it in a sterile container. And label it. Because nobody wants to find a mystery jar of frozen pee in their freezer next to the peas.
Thaw slowly in the fridge, not the microwave (seriously, stop). Even then, it’s not “fresh”—it’s a survivor.
