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8795 Ralston Rd.
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Arvada, CO 80002

Mon-Fri, 9am-5pm

Woman examining blood samples through a microscope

Will CBD Show Up in Blood Tests?


CBD is a supplement growing in popularity. However, some people avoid using it because it might make them show up positive for drugs in blood tests. Is this a fact or just a rumor? Will CBD show up in blood tests?

Will CBD Show Up in Blood Tests?

CBD does not show up in blood tests. However, THC can make you positive for drugs in blood tests. If enough THC is present on your CBD product, it will show up in your blood tests. 

Some CBD products do contain THC. they can be in small or large amounts. People often mistake CBD and THC to be the same. This can be troubling if you’re out looking for work or other reasons for blood tests. 

Woman having her blood taken for a test

You should be careful with what CBD products you take and know how much THC it has. Removing them out of your system could take days or weeks. Hence, you should learn more about how CBD and blood tests work. 

How CBD Is Processed by Your Body

CBD is fat-soluble so it is generally stored in your body’s fat cells. This means, your Body Mass Index (BMI) affects how long it’s going to be processed in your body. The higher your BMI or weight is, the longer time it will take for CBD to get out of your system. 

If you smoke CBD, it can enter your bloodstream within seconds. That’s why people often noticed the effects faster compared to other forms of CBD such as CBD coffees and teas. it’s also the fastest to get out of your system. 

Other common forms of CBD like dietary supplements or coffees that contain CBD don’t exhibit any effects right away. Your body’s metabolism and diet can affect how fast you will feel the effects and how long it will stay in your body. 

Factors Affecting How Long CBD Stays in Your Body

  • Genetics 
  • Metabolism
  • Age
  • Weight
  • Last date of consumption
  • Dosage
  • Usage frequency
  • Method of intake


Most CBD products aren’t regulated by the Food and Drug Administration (FDA) so it is hard to know what it contains. Even if it’s legal in your state, you should still be wary. 

There are types of CBD that don’t have that much THC or none at all. It’s better to look for these products and knowing where your CBD comes from will help you pass the blood tests. 

Woman taking a sip of her CBD coffee

Types of CBD Extracts

CBD comes from a plant family called cannabis. Cannabis plants contain a lot of natural compounds which include cannabinoids, terpenes, and flavonoids. CBD’s chemical composition differs depending on the plant strain and variety.

Full-Spectrum CBD

Full-spectrum CBD extracts have all the compounds that are naturally present in the plant which it was extracted from. This includes THC which can result in a positive blood test. 

Full-spectrum CBD products generally use marijuana as the base plant. These extracts may contain varying amounts of THC. full-spectrum hemp-derived CBD oil on the other hand, is legally required to only have less than 0.3% of THC. 

It’s generally hard to know what full-spectrum extracts CBD products have. Most manufacturers don’t disclose it so it can be very hard. Your best option would be to ask around the CBD community and check out some reviews. 

Broad-Spectrum CBD

Broad-spectrum CBD is much like full-spectrum CBD. However, most of the THC in it is removed. Hence, you will  most likely get less THC. 

It’s often a hit or miss in blood tests when you are taking broad-spectrum CBD. Hence, it is still better to not take it weeks before taking a blood test. 

CBD Isolate

CBD isolate is composed of pure CBD. It doesn’t have any additional compounds from the plant where it was extracted. Most CBD isolates are extracted from hemp plants. Hemp-based CBD isolates should never contain THC. 

CBD products that use CBD isolates are your best option if you want to continue using CBD even with your blood tests coming. 

Woman examining blood samples through a microscope

Other Reasons Your Blood Test Could Result in a Positive

Although THC can be removed quickly from your bloodstream, there may be other factors that could affect the results. Blood tests are rarely done compared to urine tests for drug screening because of this. 

THC can be detected for up to five hours in plasma while THC metabolites  can last for seven days. Blood tests are often used for driving under the influence to test for impairment. 

Even though CBD is legal, some states do not allow you to drive in certain doses. THC blood concentration between one to five ng/mL is generally illegal in some states. Some even impose zero-tolerance. 

  • Cross-contamination - the manufacturer might accidentally put THC during the manufacturing process. What you thought  of a THC-free product may then contain THC. This could also happen at home if you put your CBD products near each other. 
  • Secondhand exposure - THC can be present in the smoke exhaled. Although it is unlikely that it will show up in the blood test.
  • Product mislabeling - since most CBD products aren't regulated by the FDA, you may not know what the product’s actual composition is. Some shady people can add some THC in there to cut some costs. 

Related Questions

Will CBD Ruin a Drug Test?

Pure CBD does not cause a positive in drug tests. 

How Do You Clear Your System of CBD?

Diuretics can help clear your system of CBD. Diuretics help speed up urination which in turn help detoxify and expel CBD in your body. Combine this with drinking lots of water and the process should be faster.


CBD does not show up in blood tests. You only need to be wary of THC to make sure you are up to date with recent information about CBD products in the community. It’s better to just stay off CBD for weeks when you know blood tests are coming.