How Quickly Does Synthetic Urine Go Bad? 4 Things to be Aware Of

A synthetic urine on a toilet

Does a reliable synthetic urine expire? The quick answer is yes, it does. And when it does, whether you need the urine for a prank, a drug test, or a science experiment — you’re probably screwed.

Especially if you’re using it for a drug test, you’ll want to make sure it passes the test. We’ve listed all the information you will need about the expiry and shelf life of your fake urine.

What is Synthetic Urine? Synthetic urine being held by a person with protective gloves

Synthetic urine is a liquid designed to mirror the look and make-up of real pee [1]. It’s most commonly used by companies to test how urine impacts their products: medical devices, mattresses, diapers, etc.

It’s also used by individuals who can’t produce a clean urine sample for some form of pee test. They use synthetic urine to pass their drug tests.

With the advancements in technology, synthetic urine can be hard to distinguish from the real urine. Using synthetic urine can be nerve-wracking, and author Steven Magee once said,

“I became wary of medical blood and urine tests and came to regard them as very misleading.”

The key to a successful synthetic urine test is the ability to pass as the real thing. Real pee contains urea, creatinine, and certain proteins that need to also be found in the fake alternative [2]. The copies also have a musty odor that mimics that of real urine and its signature yellow color.

Can I Store Synthetic Urine Sample?

The short answer is yes, you can store synthetic urine, but you should store it in a proper place. It won’t be surprising to hear that synthetic urine also has a shelf life like many other products.

Synthetic urine can be safely used for up to three years after packaging, but only if properly stored. Opening and closing the synthetic urine sample will cause contamination and the quick ruin of the sample.

The product must be placed in a cool, dry place like a refrigerator or freezer. They do the best job of preserving the pH and gravity of the synthetic urine. Before placing them in the cool, dark area, write the date on the side of when it was last opened or bottled.

Read More: Can You Freeze Synthetic Urine?

Signs of Expired Synthetic Urine SamplesA person covering her nose from a bad odor of expired fake urine

Fake pee does expire, and you need to be prepared for when it does. Don’t get caught red-handed using outdated synthetic urine. While it might be hard to pinpoint an exact expiration date, here are a couple of things you are looking out for.

1. Odor

Both real and fake pee need to have that musty smell that is distinctly urine. To some, that smell is similar to ammonia. When it expires, the smell will turn rotten.

If you begin to notice that smell, simply throw away the expired sample and use a different batch. An overly odorous smell means it has passed its shelf life. Don’t try to use it!

2. Color

Your fake pee sample should be slightly yellowish like pee. If you notice that it’s changed color, then it’s most likely expired.

Another worrisome color change is if you notice the sample becoming cloudy. When fungi and bacteria begin to breed in the fake urine, they dull the overlook of the sample.

Finally, if you open the bottle and find goopy and congealed synthetic urine, quickly throw it away. You won’t be able to pass any sort of drug test because it’s definitely expired.

As long as the fake pee is the proper yellow color, you can use it.

What Factors Can Lead to Damage in Synthetic Urine Kits?

Preserving the integrity of synthetic urine is essential for passing urine screening tests successfully. Several factors can potentially compromise the effectiveness of synthetic urine samples. These include:

  • Overheating: Storing synthetic urine in freezers or refrigerators can result in overheating upon removal. Rapid temperature changes can alter its chemical properties, rendering it unsuitable for its intended purpose.
  • Improper use of heat pads: Many people rely on heat pads or hand warmers to maintain synthetic urine at body temperature. However, caution must be exercised as these methods may not offer precise temperature control, potentially damaging the synthetic urine sample.

By considering these factors and taking necessary precautions, you can safeguard the integrity of synthetic urine and optimize its effectiveness during urine screening tests.

How to Make Synthetic Urine Last LongerA scientist holding a fake urine sample

To maximize the shelf life of your reliable synthetic urine products, you must follow the specific instructions. Companies like Urine Drug Test HQ, Quick Fix, Sub Solution, and Spectrum Labs will have particular ways of storing their samples. But the best way to keep the synthetic urine fresher for longer is proper storage.

Here’s how to store your fake pee:

  • Store the sample away from direct sunlight or any source of heat.

The product’s bottle is left in the sunlight, and its internal temperature will rise. This leads to bacteria growth that will ruin your batch. If left in direct sunlight for less than an hour, it is still a viable sample; however, it will negatively affect the product if left longer than that. 

  • Keep it in a cool, dry place, ideally in a refrigerator or freezer.

The fake pee will have an expiration date on the container that should be heeded even if you follow the storing directions. It’s important to store your fake urine properly to last a long time and be viable when tested in a lab.

Read More: How to Make Synthetic Urine (Our #1 Recipe for Homemade Pee)

Frequently Asked QuestionsClose up shot of a fake urine

Can expired synthetic urine still be used?

No, you need to throw all outdated samples away. The whole point of using synthetic urine is for passing a drug test, pranking friends, or for product testing.

Every lab in the country will detect that the urine is fake with a simple chemical strip test and visual inspection. Don’t be caught with fake urine, so stay clear of trouble and keep it only to its ending date.

Can fake urine be reheated?

Yes, you can heat your sample once. Never reheat a single sample because it affects the sample by introducing an excessive amount of oxygen to it.

Only warm the container in the microwave when you are ready to use it for drug tests or other purposes. Using heating pads could also work on warming up the fake human urine. However, it will take longer to reach the optimal temperature.

Most people use the microwave for heating a sample. Typical urine is 90 to 100 degrees, so if you use synthetic urine for illegal purposes, make sure to reach that temperature. To pass a lab test, you’ll want to make sure the fake pee is as accurate as possible.

Can labs tell the difference between real and synthetic urine?

Yes, but they can be tricked with the right formulas. Not all synthetic pee is the same.

You will want a kit that has a complicated formula, which might mean it’s more expensive. A good sample will have the right levels of the following as in real pee:

  • Creatinine levels
  • Temperature
  • Specific gravity

Urine samples that are cheaper will not pass a drug screening because they are nothing like the real thing. A lousy sample might pass a quick human test, but advanced drug testing means a deeper scrutiny of the product. When you want to pass a urine test, look for a product that has a long ingredient list with things like uric acid on it.

What happens if the fake urine is left in direct sunlight?

Synthetic pee is very delicate and will go bad easily if you store or keep the product under direct sunlight. A change in the oxygen level will affect the creatinine and the specific gravity of the product.

If you are using fake pee, make sure to leave it out of direct sunlight. You can’t make synthetic urine last if left outside or in sunlight for more than an hour. To pass a urine test, you’ll need a product that has not been compromised in any way.

So, Does Synthetic Urine Expire?

Yes, fake urine expires and has a shelf life that needs to be adhered to if you want to use the product to pass a drug test or other type of testing. Even if using this fake human urine for a prank, you won’t want to use a contaminated product. As technology advances, our lab tests do as well. This means you need a fake urine sample that is up to date.

If you choose to mix samples, double-check the shelf life and expiration dates of the two products. If you mixed an expired urine with a good one, you have ruined both batches. The key to a long shelf life is to safely store the fake pee in a cool place away from oxygen.



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