How Long Does Weed Stay in Your Bloodstream?

Last Modified July, 2023

Do you want to know how long does weed stay in your blood stream? You have come to the right place. In this article, you will learn how long weeds stay on your system or how far back does a blood drug test go that is coming up.

What Is THC?

THC, or delta-9-tetrahydrocannabinol, is a cannabinoid compound of marijuana (cannabis). It is the one giving the euphoric effects commonly associated with marijuana use. When people consume marijuana, THC interacts with receptors in the brain, and as a result you get this sensation of being “high” or experiencing altered mental and physical states.

THC is the most recognized substances in marijuana. And it is necessary to be aware of the risks and effects of THC.

There are some reasons why cannabis is getting so popular. The first one is the changing legal landscape in many parts of the world. As more states and countries legalize cannabis, individuals who were previously hesitant to use it due to legal concerns are now more inclined to explore its benefits.

Another reason for popularity of cannabis is believing that it carries fewer risks compared to other substances. Many people think that it is a safer alternative to other drugs. Furthermore, cannabis has proven potential medical benefits.

Based on the World Drug Report 2022 by the UN Office on Drugs and Crime (UNODC), the global usage of drugs among individuals aged 15-64 has a huge increase over the past decade. In 2020 alone, around 284 million people worldwide were using drugs. That is a 26 percent rise compared to the previous decade.

How Long Does Marijuana Stay in Your Blood System?

Often cannabis users are worried about how long does THC stay in the blood. The effects of marijuana might develop within a few minutes when it is smoked. In case it is consumed, users might not feel any effects at all for a few hours. Usually, the effect lasts for 3-4 hours but might last longer when it is eaten.

However, you should know that weed doesn’t leave the body easily. Most cannabinoids get stored in the fat cells. So, it means that the effects of weed might reoccur for 12-24 hours after use since the chemicals are released slowly from fatty tissue.

While the detection window might vary but how long does it take to get THC dabs out of your system depends on your frequency of usage.


Single Use 3 days
Moderate Use 5-7 days
Chronic Use 10-15 days
Chronic Heavy Use More than 30 days

Cannabis metabolites are fat-soluble. This implies that they bind fat molecules in the body. Hence, it might take some time for the cannabis metabolites to leave your system, especially if there are more fat molecules in your body. So, now you know that the answer to the question can weed be detected in a regular blood test is yes.

What Factors Affect How Long Does Weed Stay in Your Blood?

To know if will a regular blood test show THC, you need to know the length of time THC remains detectable in the blood and the body varies and is influenced by several factors, including:

Body Mass Index (BMI)

Individuals with higher body fat percentages tend to retain THC for a longer duration. This is because THC can be stored in fat cells, and individuals with higher BMIs may have more fat cells to store THC. So, BMI determines how long does weed stay in your system.

Consumption Patterns

The amount and frequency of cannabis use play a role in how long THC stays in the blood. Higher doses and more frequent use can lead to longer detection times.


How long does weed stay in your system depends on metabolism, too. This can impact the THC elimination rate. Individuals with faster metabolisms typically eliminate THC more quickly from their system.

Potency and Route of Administration

The potency of the cannabis consumed can influence the duration of THC detection. More potent cannabis strains with higher THC levels may stay in the system for a longer period. Additionally, the route of administration, such as ingestion versus smoking, can affect how long does weed stay in your system. Ingested cannabis may linger in the system slightly longer than smoked cannabis.

It is important to note that the exact duration of THC detection can vary among individuals based on these factors. Additionally, drug testing methods and thresholds can also influence the detection window. Therefore, it is challenging to provide precise timelines as they can vary widely from person to person.

In situations where fast and reliable detoxification is required, high-quality detox supplements such as Toxin Rid are recommended. These supplements are specifically formulated with potent ingredients to assist in the detoxification process, especially when preparing for a blood drug test. Toxin Rid is known for its effectiveness in helping to eliminate toxins from the body. It is designed to support the body’s natural detoxification mechanisms and can provide a more reliable and efficient approach compared to homemade remedies.

When and Why Do Employers Drug Test?

Employers might ask their employees to get a drug test for various reasons. Drug testing serves various purposes, including promoting safety, productivity, compliance, accuracy, and safeguarding the well-being of employees, coworkers, customers, and the public. Drug testing helps identify drug abuse among employees, allowing for intervention, support, and prevention of relapse.

Here we are going to take a look at why employers might perform blood tests on marijuana.

Pre-Employment Drug Testing

Potential employees may be required to undergo a drug test when accepting a conditional offer of employment which might cause you to wonder how long does weed stay in your system.

Random Drug Testing

Some organizations implement random drug testing, conducting tests on employees without prior notice.

Post-Accident Drug Testing

Following a workplace accident, if drug use is suspected, employers may schedule a drug test as per insurance policies or federal guidelines.

Periodic Drug Testing

Employers may conduct drug tests periodically, even after the hiring process, to ensure compliance with their drug testing policy.

Drug testing may be required by various entities other than employers. These include:

  1. Law Enforcement: In situations where an individual is suspected of driving under the influence or if drug use is suspected in the commission of a crime, law enforcement officials may require a drug test to gather evidence or establish legal implications.
  2. Sports Organizations: Athletes participating in organized sports may be subject to drug testing to ensure fair competition and maintain the integrity of the sport. This helps prevent the use of performance-enhancing drugs that could provide an unfair advantage.
  3. Schools: Some educational institutions may implement drug testing as a requirement for participation in extracurricular activities or as part of broader drug prevention programs. This is done to promote a safe and drug-free environment for students.
  4. Rehabilitation Programs: Individuals enrolled in drug rehabilitation programs may undergo regular drug testing as a component of their treatment and recovery process. These tests help monitor progress, verify abstinence, and support the individual’s journey toward sobriety. It’s important to note that the specific circumstances and policies surrounding drug testing can vary among these entities. The aim is typically to ensure safety, compliance, fairness, or adherence to treatment protocols.

How Long Does Weed Stay in Blood, Urine, Saliva, and Hair?

The duration that THC, the psychoactive compound in cannabis, remains detectable in the body and shows up in drug tests can vary based on several factors. These factors include the amount of body fat, frequency and quantity of cannabis consumption, and the sensitivity of the drug test being used. Different types of drug tests have varying detection windows for cannabis:

Urine Tests

Cannabis can be detected in urine for approximately 3 to 30 days after use, depending on factors such as frequency and quantity of consumption. This is the most common type of drug test for cannabis.

Saliva Tests

Cannabis can typically be detected in saliva for approximately 24 hours after use. In some cases, certain saliva tests have detected cannabis for up to 72 hours after use.

Hair Tests

Hair tests are the most sensitive type of drug test for cannabis. THC can be detected in hair follicles for up to 90 days after use, providing a longer detection window compared to other types of tests.

Blood Tests

Blood tests have a shorter detection window for THC. Typically, THC can only be detected in the bloodstream for approximately 3 to 4 hours after use.

This will give you a fair idea when you are wondering if I smoke once, will it show up on a blood drug test.

The Methods that Will Help Get Weed Out of Your System for Urine and Blood Test Marijuana

In case you are worried about how to pass a drug test with weed in your system then you should know that detoxification can help.

These detoxification methods that are answers to how to pass a blood drug test by getting weed out of your system. Let’s take a look at the top methods to get cannabis out of your system.

Detox Drinks

Detox drinks have been developed to flush toxins out of the body. They help in diluting the urine and replace toxins with lost nutrients, such as vitamins and creatine. Check out the top detox drinks you can consider if you are looking to pass your drug test.


  1. Detoxify Mega Clean
  2. QCarbon32
  3. High Voltage Detox Drink

Nevertheless, you should keep in mind that detox drinks have a higher risk of failure, particularly when you have loads of drug metabolites in the body.

Detoxify Mega Clean

This is one of the most standard detox drinks and is available in online stores, such as Amazon and Walmart. It contains diuretic herbs, creatine, and B-vitamins. The detox drink has zinc and electrolytes, too. These are known to give the results you are looking for.

One research has shown that Mega Clean can start showing results in just an hour and can be effective for 5 hours. But you have to make sure that you are following the instructions carefully while using it.

Check out the ingredients of the product:


  • Taurine
  • Thiamine
  • Niacin
  • Riboflavin
  • Vitamin A
  • Vitamin B6
  • Vitamin B12
  • Vitamin D

To use the detox drink, you will have to follow these steps:


  • Shake the bottle well and drink the whole bottle’s content.
  • Wait for fifteen minutes and then refill the bottle with water to drink it.
  • Urinate frequently to get rid of the toxins from the body.

You should use Mega Clean on the day of the drug test. To get the best results avoid using any toxins for a minimum of 48 hours before using Mega Clean.


  • Manufacturer: Detoxify
  • Customer Support: Email – [email protected]
  • Phone Support: 1-800-DETOX4U (800-338-6948)

Detoxify Mega Clean is available at a discounted price of $39.99. It might be available at other retail sites. However, it is always advisable to buy from the official site.


  • Combination of strong natural herbs.
  • Adds natural color to the urine without looking fake.
  • Quick results, which can last up to 5 hours.
  • A respectable brand that has a good reputation in the market.


  • The price is a little higher than other detox products.
  • In certain cases, it might lead to diarrhea and nausea.


It is a detox drink by Herbal Clean, which claims to help people in passing a drug test by masking the drug metabolites. The drink contains diuretics, herbs, fiber, creatine, and B-vitamins. It works well like other same-day detox drinks. If you use it in combination with Toxin Rid, it will work as an excellent complement.

The ingredients of QCarbo32 are listed below:


  • Creatine
  • Diuretics
  • Herbs
  • B-Vitamins
  • Fiber
  • Apple Pectin
  • Turmeric Root Extract
  • Juniper Berry Extract

To get the best results, you will have to shake the bottle before drinking the liquid, drink the content of the bottle within 30 minutes, and urinate as frequently as you can.



  • A blend of natural components.
  • Variety of tests more than other detox drinks.
  • It offers a satisfaction guarantee.
  • Available at a reasonable price.


  • It might not work for all users.
  • This can lead to effects, such as an upset stomach or diarrhea.

High Voltage Detox Drink

The detox drink claims to help drug users pass their urine test. It flushes out drug metabolites from the urine and produces a clean sample of urine through a method called dilution. The product is a powerful toxin cleanse that delivers results in both liquid and capsule forms. Its formula is based on the idea to stimulate the metabolic processes in the kidneys and liver to help filter out and get rid of the toxins in the urinary tract.

To get the best results and pass a urine drug test, you have to consume the whole bottle of the detox drink on the day of the test. Wait for around 15 minutes and fill up the bottle with water to drink it. Remember, the drink is efficacious for up to 30 minutes after consumption.


  • Contains different types of diuretics for flushing out toxins.
  • Available in different flavors.
  • Not as expensive as other brands of detox drinks.
  • Includes Vitamin B which makes the urine yellow.


  • Many herbs present in the products are also laxatives.
  • At times urine tests might give invalid results.
  • Doesn’t have zinc.

Detox Pills

Detox pills work just like detox drinks. When taken, it will help in flushing out toxins from the body. Usually, they have natural ingredients, such as vitamins and herbs, which help in speeding up the detoxification process. ToxinRid is one of the best products in the market. It is safe, potent, proven, and natural. It will help in pushing out more drug metabolites than you can naturally.

Toxin Rid

Toxin Rid has been designed to remove toxins that have accumulated in the body by using cannabis. It has ingredients that can detox the body and flush out toxins. Even if you are a regular weed user, it can work for you. As it removes all drug metabolites from the body, any type of drug testing method.

The ingredients present in Toxin Rid are:


  • Iron
  • Kelp
  • Magnesium
  • Calcium
  • Boron
  • Sodium
  • Potassium
  • Chloride

When you use Toxin Rid, you have to follow a 10 days detox program. The first step is to refrain from taking weed for 24 hours. For the next 9 days, you have to swallow pills at an interval of 5 hours. Consume 3 pills every time. Take the test on the 10th day.


  • Manufacturer: Test Clear
  • Contact: 1-877-TOXIN-74


  • Works for alcohol, too.
  • Flushes out toxins for all types of weed users.
  • Suitable for vegans.
  • Gets rid of drug residues from saliva, blood, urine, and sweat.
  • Works from the very hour you consume it.


  • Might lead to diarrhea.
  • Might be a little more expensive than other products.

Home Detox Remedies

Many home remedies will help with the weed detoxification process. A few of these are lemon water and vitamin B supplements, cranberry juice, and baking soda. However, you should know that home remedies tend to be less effective and might not help in passing a drug test.Many home remedies can help in detoxing and passing urine and blood test.

Cranberry Juice and Azo

The first one is a natural diuretic that helps in flushing out toxins from the body. While the second one is an over-the-counter medication, which helps in relieving urinary discomfort and pain. It is one of the easiest methods to detoxify. But its effectiveness varies from one individual to the other.

Baking Soda-Often

People claim that baking soda can help pass a drug test by changing the pH of your urine. But there is no scientific evidence to support this claim. Also, too much baking soda can be harmful to your health.

Lemon Water and Vitamin B Supplements

Drink lemon water as it helps in detoxifying the liver and get rid of toxins from the body. While having Vitamin B restores the natural color of urine. But its effectiveness varies based on the individual.

Question and Answers

How Long Does Weed Last in Blood?

Blood tests for THC can only detect the presence of the substance for a short time, typically 3-4 hours after use. However, this can vary depending on factors such as the amount consumed and the frequency of use.

Do Regular Blood Tests Show Drugs?

Regular blood tests, such as routine medical blood work, do not typically include drug screenings. If a drug test is required, a specific drug test would need to be ordered to detect the presence of drugs in the blood. These specialized tests are designed to target specific substances and their metabolites.

Can I Do Something to Force Metabolism?

No, metabolism cannot be forced on your body. However, a few supplements help in increasing the metabolism. Even though it might take time that is usually not available in terms of drug tests.

Do Regular Blood Tests Show Drugs When I Consume Weed Just Once?

Even if you have consumed drugs just once, it is going to show a positive drug test. In case you can consume weed, it is traceable for up to 3 days.

How Long Does it Take to Detox Cannabis?

When you are going for a drug test, you might want to know how long does weed stay in your system. The time of detox will depend on the amount of cannabis you are consuming. In case you are a heavy user, you can test positive in a urine drug test even after thirty days.


Now, that we have come to the end of this review and you might have an idea about how long will one smoke session stay in your system. Weed stays in the system for a long time. Sure, weed has its benefits. But you shouldn’t misuse it. Misuse can cost you your job and also too much of something can lead to negative effects.

In case you have a drug test coming up, you can try out the different detoxification methods for weed withdrawal. One of the most effective detoxification methods is detox drinks. These detox products are the safest option in case you have a short drug test window.

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