How Long Can Pee Be Stored

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Stick it in the fridge at about 39°F (4°C), and you can stretch that party to 24 to 48 hours before it starts to sour. That’s why doctors tell you to chill a sample fast—but don’t freeze it! Freezing urine is like putting a soda can in the freezer: it expands and cracks, and suddenly you have a urine-sicle explosion. Not ideal for your lunch leftovers.

For longer storage, you’ll need a deep freeze at -20°F (-29°C) or lower. In a lab, frozen pee can last for years—yes, years—if handled properly. But here’s the kicker: even frozen, the chemistry changes. Urea breaks down into ammonia, and crystals form. It’s like the urine is going through a midlife crisis.

Urine Storage: How Long Can You Keep It? | MedShun