Effective Methods for Keeping Your Pee Warm and Passing Your Drug Test with Confidence

Robert J. McGrath
Robert J. McGrath, Ph.D

Last updated on 2024 May 28

In this article, I’ll review the most effective ways to keep your urine sample warm for a drug test.

Even if you are using the best synthetic urine, if you submit it at the wrong temperature, you are in trouble. This can lead to a lost job opportunity or even legal penalties.

So, there are three ways to keep the urine sample warm:

  1. By using body temperature
  2. By using heat pads or hand warmers
  3. By using an electric urine warmer

I’ll explain how to use each of these methods in detail.

What temperature should urine be for a drug test

If you’re scheduled for a drug test at LabCorp or any other lab, the urine temperature must be within a specific range. The urine temperature should be between 90-100 degrees Fahrenheit (36 – 38 degrees Celsius).

The normal temperature for urine is the same for both females and males. When urine leaves the body, it typically has an average temperature of about 98.6 degrees Fahrenheit (37 degrees Celsius).

The drug test requirements state that you must submit the sample within 4 minutes after peeing.

The urine sample can cool down during that time. That’s why drug tests accept the temperature range of 90-100 degrees Fahrenheit.

The Incognito Belt
incognito belt
  • Synthetic urine identical to human urine.
  • Discreet and undetectable urine bag.
  • Reliable heating option.
  • Everything you need to pass a drug test.

Failed drug test because of urine temperature: what happens next

If the urine is not warm enough for the drug test, the collector will require you to provide a second specimen as soon as possible under direct observation.

supervised drug test

Direct observation means that the collector will watch you pee. Refusing to provide a second specimen will be reported as the result.

The result will be reported to the medical review officer and your employer.

Most, if not all employers treat a refusal as worse than a positive, and consider it an ‘insta-fire’ offense.

Also, collectors consider a below-body temperature as cheating, and they will require you to provide another sample.

The most effective ways to keep your urine warm for a drug test

The most reliable and convenient way to warm urine for a drug test is to use hand warmers or heat pads. They can heat the urine bottle and keep it warm enough for several hours.

How do hand warmers work

Hand warmers work by creating heat quickly. Some can keep making heat from 7 to 24 hours.

They have five main ingredients:

  • iron powder,
  • water,
  • salt,
  • activated charcoal,
  • and a mineral called vermiculite.

When oxygen from the air mixes with the iron, water, and salt in the packet, it makes the iron rust fast.

This rusting process creates heat. Normally, when things like a car rust, it’s too slow to feel warm.

But hand warmers make this process fast so you can feel the heat right away.

Vermiculite helps by controlling the water inside the packet, which keeps the rusting going.

Activated charcoal spreads the heat evenly so it’s comfortable on your skin and also helps control the speed of the heating up.

Difference between heat pads and hand warmers

Hand warmers are created to keep your hands warm in cold weather. They produce a higher temperature than your body’s natural warmth.

They can heat up to between 100 and 180 degrees Fahrenheit.

As a result, they can easily cause the urine sample to become too hot, potentially damaging its composition.

To prevent any issues, I suggest using specific heat pads designed for synthetic urine.

These pads are designed to provide the perfect amount of heat to warm the urine to body temperature without risking overheating.

The heat pads that come with the urine kits have less powder inside to make sure they don’t get too hot.

They also have a sticky side so you can easily attach them to the urine bottle.

heat pads for synthetic urine

Hand warmers don’t have this sticky side, so you’d have to use a rubber band to attach it, which is not as reliable or easy. The special heat pads are just more convenient and safer for heating synthetic urine.

heating pad applied to synthetic urine bottle

How to use heat pads or hand warmers to keep synthetic urine warm

  • You need to activate the hand warmer according to the instructions.
  • Attach it to the urine bottle using the adhesive side of a heat pad or a rubber band if you’re using a hand warmer.
  • Place it on the side opposite the temperature strip.
  • Then, tuck it securely into your underwear both to keep it warm and to hide it.
  • You can use a stash leg belt or special underwear for convenience.
  • On arrival, just before you go in, make sure you check the temperature.
  • If your urine was cold, it will take about 30 minutes to raise the temperature of the urine with a hand warmer.

Low quality handwarmers can make the urine too hot. Use heat pads that are designed for using with synthetic urine.

Heat activator powder

Another good option is to use heat activator powder. This powder heats up urine within seconds and allows great control over the temperature. Such powder usually comes with high-quality synthetic urine kits.

The drawback of using heat activator powder is that you have to figure out what to do with the vial containing the powder.

When you go for a drug test, you’ll be required to empty your pockets. If they happen to notice the vial, they might ask you to provide the urine sample under direct observation.

This means you have to find a way to conceal both the urine bottle and the bottle of heat activator powder, which can be quite challenging.

How to use heat activator powder

heat activator powder in bottle

Carefully add 1/3 of the heat activator into the mixing container.

If the temperature on the strip indicates a solution temperature of 88°F to 92°F then we recommend that you only add 1/4 of the heat activator into the mixing.

Gently shake the contents to completely dissolve the heat activator, which usually takes less than 20 seconds.

After the heat activator granules have completely dissolved, read the temperature strip to ensure that the solution is within the required temperature range of 94°F to 100°F (indicated in green).

How to keep urine warm without hand warmers

However, if you don’t have heat activator powder or a heat pad, there are other methods to keep your urine warm. First, you’ll need a container for the urine.

It can be a pill bottle or a condom, but we recommend using special urine bottles with temperature strips. Such bottles allow convenient temperature control without using additional thermometers.

urine bottle empty with temperature strip

Once you’ve put your clean urine in the container, here are three options to keep it warm:

Between your legs

  • Put the bottle in your pants right between your legs in the crotch.
  • It’s better to use tight pants so the bottle will be closer to your body.
  • The urine will stay warm in the crotch as long as you keep it close to your body.
  • Make sure you wear a dress or loose pants, so no one can notice the bottle in your pants.
  • If you don’t use a bottle with a temperature strip, hide a digital thermometer in your clothes.

The urine will stay warm between your legs as long as you keep it close to the body in the pants.

In a bra

This method is almost the same as the previous one.

  • You need to place the bottle in your bra, close to your body.
  • The method is worse because the bottle in a bra is more noticeable.
  • You also have to fix the bottle with adhesive tape because you don’t want it to fall out.

How to warm up urine from the fridge

If you’re using refrigerated urine or the urine sample is at room temperature, it can take more than 1 hour to warm it to body temperature with hand warmers or body heat.

So it’s better to preheat it using a microwave. Microwave the sample for about 10 seconds on full power.

Shake it gently, and watch the temperature strip. If there is no reading, do it again for another 10 seconds.

You want to get a reading on the temperature strip that is as close to 100°F as possible, but without going over (otherwise, there won’t be a reading showing again, and you will have a dramatically overheated sample).

If the urine is too hot, just let it cool down for a few minutes. Use a thermometer or temperature strip to control the temperature.

How to heat up synthetic urine without a microwave

If you don’t have a microwave available, there are other ways to heat up synthetic urine.

You can heat it in a water bath on a stove, in hot water, using a heating pad, or by putting it close to the body. However, the last method will require at least 1 hour to heat it to body temperature.

Check the temperature

On arrival, just before you go in, make sure you check the temperature.

If it has cooled down (because the heat pad has been unreliable), use the second heat pad to restore the temperature.

It’s crucial to keep the urine within the required temperature range to ensure that you pass the drug test.

Remember, cheating on a drug test is illegal, and synthetic urine is meant to be used for legitimate purposes only.

Follow these tips carefully to keep your synthetic urine warm and stay out of trouble.

How to check the temperature of the urine

If you want to pass a drug test using synthetic urine, you need to ensure it’s at the right temperature. Here’s how you can check it:

You can use a waterproof digital thermometer to check the temperature of the urine. But it’s not always convenient to use, especially if you’re doing the test in public.

It’s better to use temperature strips instead. These strips are easy to use, and they’re more convenient. You can attach them to the bottle, and they’ll give you an accurate reading.

When using temperature strips, you need to check that the maximum temperature allowed is over 90 F. Many strips have a maximum temperature of 90 F, so you need to be careful.

temperature strip readings

The best synthetic urine kits have a temperature strip attached to the bottle.

This makes it easy for you to check the temperature, and you don’t have to worry about buying separate strips.

A few words about using someone else’s urine

Using someone else’s urine for a drug test is a bad idea. Here’s why:

You never know what drugs the person actually used. They may think they’re clean, even if they smoked cannabis a couple of weeks ago. Cannabis metabolites can stay in your body for a long time.

Human urine spoils fast. Even if you keep it in a fridge, it will be detected on a drug test. If urine spoils, it will change color, and the collector will see it. They will request a drug test under direct observation.

You need to submit urine at the right temperature, so you still need the heating pad. You can use a bottle of water, but that’s risky.

The cheap shortcut of trying to get someone else’s urine to submit is not worth it.

Use high-quality synthetic urine instead. The risk is not worth it.

Best synthetic urine kits with the most convenient way to keep your urine warm

Incognito Belt: The best overall synthetic urine kit

incognito belt on a female waist

The Incognito Belt is a premixed synthetic urine kit that comes with everything you need to pass a supervised drug test.

It includes enough high-quality synthetic urine for two uses, two heat pads to maintain the temperature, and a velcro adjustable discreet belt to hide the urine on your waist.

The rubber tube and convenient clip allow you to discreetly deliver the urine even while being supervised.

The detailed instructions make it easy to use, and at $130, it’s a bit pricier than Sub Solution but still worth the investment.

Get Incognito Belt

Quick Luck Premium Synthetic Urine kit

The kit includes:

  • 3oz of premixed synthetic urine
  • 1 temperature strip
  • 2 heat pads
  • Heat activator powder
  • Detailed instructions

While a little pricier the ease of use of the Quick Luck Premium Synthetic Urine kit definitely justifies its price. As long as you use it according to the instructions, the product will grant you the desired result.

Since it’s already premixed, the product can be used at a moment’s notice. It already comes in a handy bottle you can heat it up and use for testing.

A heat activator formula is also included so you can raise the synthetic urine’s temperature to normal body temperature. You can use the heating pads to keep it at that temperature for up to 6 hours.

Its chemical composition is a result of the manufacturer’s effort to improve its previous formula. Despite being fake urine, the sample you get has all the necessary chemical components to pass any drug test.

Out of the 11 different chemical compounds it contains, none will lead to toxin detection or degradation. In fact, the product’s uric acid and creatinine levels are specifically designed to align with that of natural urine.

Price: $105

Learn More About Quick Luck

Sub Solution: The best budget synthetic urine kit

clear choice sub solution contents

Sub Solution synthetic urine contains at least 11 chemicals found in human urine, making it virtually identical to the real thing. Plus, it includes a heat activator powder to heat the urine to body temperature within seconds.

The temperature strip attached to the bottle makes it easy to maintain the urine’s temperature, and the kit is undetectable and toxin-free.

At just $90, it’s the best balance between price and product features.

The only downside? You’ll need a place to hide the bottle with heat activator powder. That’s why we recommend using synthetic urine with heat pads instead.

Get Sub Solution

The Urinator: an electric warmer belt with a high price tag

Finally, there’s The Urinator. While this synthetic urine kit is reputable and reliable, the $190 price tag is quite steep.

It comes with a computerized digital controller that maintains the correct temperature and is sealed to prevent electrical shorting, but we don’t see the reason to pay so much when there are other great options on the market.

Accessories that will help to keep urine warm

Stash Leg Belt

stash leg belt on female leg

If you’re looking for a device that will help you keep your synthetic urine warm for longer, the Stash Leg Belt is a great option.

Here are some of its key features:

  • Fits most standard size synthetic urine bottles
  • Made of high-quality Neoprene material for a comfortable and flexible fit for most thigh sizes
  • Helps to keep your bottle warm longer, making it perfect for long periods of wear
  • Conceals your valuables

At just $30, the Stash Leg Belt is a cost-effective way to keep your synthetic urine warm for a drug test.

Stash Boxers

For a more comfortable option, the Stash Boxers are designed with a dedicated front, inside pocket with ample space, and quick easy access with no button or zipper hassle.

Here are some of its key features:

At just $35, the Stash Boxers are a great option for those who want a more comfortable and stealthy way to keep their synthetic urine warm.


While there are several options available to keep your synthetic urine warm, the most reliable method is using heat pads. While they take some time to heat the urine to body temperature, they can keep it for up to 10 hours.

We recommend using the Quick Luck Synthetic Urine, which already includes the reliable heat pads and heat activator powder which can heat the urine within seconds.

It is the best synthetic urine kit on the market today, containing at least 11 chemicals found in human urine, and is undetectable, reliable, and effective.

For a more discreet option, we suggest using the Incognito Belt with heat pads. Whatever your choice, these devices will help you pass your drug test with flying colors!


What is the normal temperature for female urine?

The normal temperature for female urine is the same as for male urine. When urine leaves the body, it is typically around 98.6 degrees Fahrenheit (37 degrees Celsius). This temperature reflects the body’s internal temperature, which is the same for both genders.

What temperature should urine be for a drug test?

For a drug test, the urine temperature must be between 90-100 degrees Fahrenheit (36-38 degrees Celsius). Drug tests require the sample to be within this range because it closely matches the body’s natural urine temperature at the time of urination.

How long does synthetic urine last once heated?

Once heated, synthetic urine can maintain its temperature for several hours if kept properly. Using heat pads or hand warmers can help keep the urine at the correct temperature for up to six hours, ensuring it remains suitable for a drug test.

How fast does pee cool down?

Pee cools down relatively quickly once it leaves the body. Within a few minutes, the temperature can drop significantly, especially if exposed to cooler air. This is why it’s crucial to submit the sample for a drug test within 4 minutes after peeing.

How long will urine stay good for a drug test?

Urine can stay good for a drug test if kept at the right temperature and conditions. Fresh urine should be used within a few hours. If refrigerated, it can last up to 24 hours, but it needs to be warmed to the correct temperature before the test.

Can you microwave pee to keep it warm?

Yes, you can microwave pee to keep it warm. Heat it for about 10 seconds, then check the temperature. If needed, heat it for another 10 seconds. Be careful not to overheat it. Once warmed, use a heat pad to maintain the temperature until the test.