By Luke Sumpter Reviewed by: Gloria Payá

Want to accurately judge the potency of your buds before taking a single puff? Performing cannabis testing at home allows you to pinpoint the levels of THC, CBD, and even terpenes in the material you’re blazing.

Cannabis culture has changed a lot in the last few decades. Growers and smokers now have access to an untold number of new strains, and each cultivar offers something slightly different when it comes to taste and effect. There are countless terpene profiles available, and even new cannabinoid profiles are beginning to storm the scene.

THC and CBD levels have also risen across the board. Consumers can access strains with THC values of over 30% if they really want to test their mettle, and extracts offer even higher quantities of the cannabinoid (near 100% in some cases). Some strains also offer sky-high levels of CBD (e.g. 20%+) with only trace amounts of THC.


Why Test THC Levels in Weed?

While recreational growers tend to be perfectly happy playing roulette every time they hit a new strain, many holistic users are concerned with the exact blend of phytochemicals entering their bodies. Even some of the more fastidious recreational users may be uneasy not knowing the exact cannabinoid concentration of their buds.

Here are some reasons people test the THC content of their buds in the first place.

  • To Know What To Expect

Gauging the amount of THC in your flowers will prepare you for the effects you’re about to experience. But don’t seed banks detail the amount of THC in each strain? While true, these numbers aren’t always completely accurate. Genetics plays a role in the potency of each strain, but environmental factors do also dictate how much THC ends up in the flowers. Factors that can influence the cannabinoid profile include (but are not limited to):

Lighting
Plant health
(lack of disease and nutritional deficiency)
Growth-promoting rhizobacteria
Weeks of flowering

If you tick all of these boxes during growth, you could very well end up with THC levels much higher than average for a particular cultivar. But if your plants suffer from disease or experience poor growing conditions, the flowers could register much lower levels of the cannabinoid. Testing your cannabis will help you determine the exact amount of THC you’re working with.

  • To Make Dosing More Accurate

Cannabis testing will help you out when it comes to dosing. This is true with smoking and vaping, but also when crafting extracts and edibles. With knowledge of their THC content, you can weigh out your flowers and figure out the exact amount of THC in every dose of oil or delicious brownie.

  • To Maximise THC Levels When Growing Weed

THC testing can be used as an informative tool for growers. By testing the THC quantity of each harvest, you can experiment with new growing techniques using the same strain to see what renders the best results. In other words, you can use different lights, supplements, or locations to pinpoint the methods that maximise the potency of your yields.

Understanding the Science of THC Testing

There are two primary ways to figure out the THC content of your flowers. You can grab a testing kit and find out for yourself at home, or you can use the approximate figures provided by your retailer. We’ll explore the latter first, before delving into how to test cannabis at home.

If you’re lucky enough to live in a legal state in the US, you’ll have access to a massive variety of lab-tested weed. Many raw flowers and extracts are labelled with precise percentages that display both THC and THCA levels.

THCA vs THC

Before we show you how to carry out the equation, it helps to know the difference between THCA and THC. It might shock you to discover that cannabis contains very little THC. The psychotropic cannabinoid actually comes into being after exposure to heat. It exists in the form of THCA—a cannabinoid acid—in raw buds.

Also known as tetrahydrocannabinolic acid, THCA works in a unique way in the body. It interacts with the endocannabinoid system, but it doesn’t get you high. THCA features a heavier molecular mass than THC because it possesses an additional carboxyl group. The molecule converts to THC when exposed to the heat of a bong bowl, vaporizer, or oven in a process called decarboxylation—the carboxyl group ejects, leaving THC behind.

When you walk into a US dispensary, you’ll see detailed labels on almost every product. Companies are required by law to test their buds and extracts for THC and CBD content. Upon closer inspection, you’ll see what seem like exceptionally low levels of THC, and high levels of THCA.

Remember, most of that THCA will turn into THC when you smoke, vape, or cook your product.

Finally, you’ll see a figure for maximum THC. This number reflects the amount of THC that should be present in the flowers following decarboxylation.

But these numbers don’t always seem to add up. Let’s take a look at Bubba Kush for example. Check out the cannabinoid profile of this indica strain:

Understanding the Science of THC Testing

But hold on a second; shouldn’t a THC content of 0.82% and a THCA content of 17.4% equal a total THC value of 18.2%? Not quite. There are a few variables we need to consider to determine the true THC value of this strain.

Equation To Determine Total THC Level

As mentioned above, THCA and THC have a slightly different molecular mass—THC is 87.7% of the mass of THCA. As THCA converts to THC, the total weight of the newly formed cannabinoid makes up less of the total dried weight of the herb.

Next, we need to consider the efficiency of conversion. Not every molecule of THCA will convert to THC during decarboxylation. An estimated 75% of the cannabinoid acid will make the switch. On top of that, some THC will degrade into CBN under these harsh conditions.

Based on these variables, the following formula accounts for the imperfect conversion of THCA and takes the difference in molecular mass into consideration:

(0.75 × 0.877 × % THCA) + % THC

When we add the Bubba Kush figures into the mix, we get:

(0.75 × 0.877 × 17.4) + 0.82 = 12.26 %

This figure seems to contradict the maximum THC content on the Bubba Kush potency label, but that’s because the equation factors in the conversion rate during decarboxylation. Other methods of cannabis consumption can increase conversion and bring the total figure closer to the maximum value.

For example, heating extracts at 200°C for five minutes can bring conversion closer to 100% and minimise THC degradation into CBN. Therefore, making edibles, for example, can help to unlock the maximum THC content inside a given cultivar.

What Types of Weed Can You Test?

The formula above comes in handy when you have access to such detailed labelling. However, cannabis users in most parts of the world don’t have this privilege. Plus, you won’t have any labels to reference after harvesting your own stash. In these instances, testing your cannabis at home, or sending it off to a lab, can help you determine the cannabinoid profile of your buds. While some forms of THC testing are limited to flowers, others also analise concentrates, extracts, oils, and edibles.

How To Test THC and CBD Levels in Weed

There are three main ways to test your cannabis products. Explore them in detail below.

Home Testing Kits: How To Test THC Potency at Home

If you want to test your own flowers or concentrates at home, you have several options to choose from. Some are cheaper but slightly limited, whereas others are more expensive but produce more detailed results.

  • Colour Chart Test Kits

Colour chart kits test for both CBD and THC. They require only a small pinch of material to get a reading, and are compatible with flower, extracts, and oils. Simply take a sample and place it into the container along with the test fluid. Give it a shake and wait a couple of minutes. The solution will turn a specific colour. Compare the colour with the chart provided to determine the cannabinoid content.

As they’re cheaper than other tests, colour chart kits don’t offer the most detailed results. Some kits only test for THC levels of up to 20%, and CBD quantities of up to 2.5%. If cannabinoids in the sample exceed these readings, you’ll still be guessing. Expect to pay around €25 for a pack containing three tests.

Colour Chart Test Kits

  • Thin-Layer Chromatography (TLC) Test Kits

TLC test kits are more expensive. You’ll pay around €135 for a kit that will test between 20–25 samples. However, you get what you pay for. TLC testing offers much more accurate readings, and also tests for minor cannabinoids including CBN, CBG, and THCV.

To conduct these tests, mix 0.1g of flower, edible, or extract with the test fluid. Use the pipette provided to add small quantities of the mixture onto the coated glass plate. Position the plate into the additional jar of test fluid and watch the fluid wick up the plate.

This process detects the properties of individual cannabinoids and separates them. Next, spray the plate with the dye to reveal coloured spots. Compare the size of the dots to the template provided to figure out the quantities of each cannabinoid within increments of one percent.

Thin-Layer Chromatography (TLC) Test Kits

  • Testing Gadgets

Testing gadgets are the premium option when it comes to at-home THC testers. These devices save a lot of faff, but will cost you around €850. This is an investment geared toward growers, breeders, and those who really care about the cannabinoid content of their buds.

These handheld cannabis testing devices link up to smartphones via Bluetooth. Place a sample of flower into the device, and use your phone app to select the “flower” setting. Wait 3–5 minutes while the analyser works its magic. Next, you’ll see a chart pop up that gives a reading for THC, CBD, and CBN, as well as a host of different terpenes. The app will also suggest other strains available with similar compositions.

Testing Gadgets

THC Lab Test

Lab testing costs a lot of money in the long run. On average, you can expect to pay €80–160 per sample. Realistically, only commercial enterprises will have the resources and desire to test cannabis samples in this way. Labs use various forms of chromatography to accurately break down the chemical composition of a sample. Not only will you get accurate cannabinoid and terpene concentrations, but some companies also test for heavy metals, pesticides, and microbes to confirm the safety of each batch.

Testing THC and CBD: Is It Worth It?

It depends on how important you think strict numbers are. If you’re a recreational user, the figures provided by seed banks and dispensaries will give you a general idea of what you’re smoking. If you need more accurate numbers for holistic use, home test kits and gadgets will help you determine the true cannabinoid content of your material. Finally, lab testing serves as an important service for companies that need to know the phytochemical profile and safety of their products, but this level of analysis isn’t necessary for most people.

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Privacy Policy - Royal Queen Seeds

To ensure a safe online environment and guarantee adequate data protection, we strictly comply with all legal requirements. In this privacy statement, we provide information about how and for what purpose data is collected, safety measures, storage periods and contact details.


COMPANY NAME: SNORKEL SPAIN, SL (hereinafter ROYAL QUEEN SEEDS)

C/ Vilar d'Abdelà, 5 (nave 1) CP: 08170 de Montornès del Vallès

+34 937 379 846

support@royalqueenseeds.com


The present Privacy Policy sets out the terms on which we will treat personal data at ROYAL QUEEN SEEDS; this includes any personal data collected through our website https://www.royalqueenseeds.com/ as well as any other data we process in the course of our business activities.

ROYAL QUEEN SEEDS collects the following personal data for the purposes listed below:

SECTION 1 – PERSONAL INFORMATION WE COLLECT

1.1 Account purchases

Account purchases can only be made if you are in possession of a personal account. When you create an account or purchase something from our shop, as part of the buying and selling process we collect the following personal information that you provide to us:

This information is required for delivery. In addition, when you browse our shop, we automatically receive the Internet Protocol (IP) address of your computer. Based on this information, we can optimise your online experience and at the same time protect our online environment.

Purpose of data collection

We collect and store account-related data for the following purposes:

(a) to carry out obligations arising from any contracts between you and us, and to provide you with information, products and services that you may request from us;

(b) to set up, manage and communicate with you about your account and your orders;

(c) to conduct market research and analysis;

(d) to confirm your age and identity, and to detect and prevent fraud.

1.2 Newsletters

With your explicit permission, we may send you newsletters about our shop, new products and other updates. We send newsletters based on your explicit consent. In the event that you purchase a product, and in accordance with current regulations, we may send you commercial communications in accordance with the legitimate interest of our company, always about products or services similar to those you have purchased or contracted. In any case, you may exercise your right of opposition through the channels announced in this Privacy Policy. The following information is collected in relation to the newsletter:

We do not need to know the sex of the person in order to send the newsletter (data minimisation: by law we must ask for data that is strictly necessary to provide the service, and in this case knowing the sex is not necessary to send the newsletter).

Purpose of data collection

The data collected is used to:

(a) personalise our emails, including your name and gender;

(b) provide gender-specific content.

You can withdraw your consent at any time by using the link provided in the newsletter or the contact information provided in section 2.

1.3 Customer service and contact form

In order to provide appropriate support, our customer service employees have access to information related to the account. Consequently, their support will be highly effective and friendly. The data provided in our contact form is used by our CRM provider, SuperOffice. We will only use your details to respond to your message.

SECTION 2 – LEGITIMATE INTEREST

If you have purchased any of our products, please note that we may process your personal data for promotional purposes, based on Royal Queen Seeds' legitimate interest only to offer you products or services from our company and about products or services similar to those you have purchased. You may exercise your right to opt out of future messages by the means set out in this Privacy Policy or through any notification you receive.

2.1 How do you withdraw consent?

If you change your mind, you can withdraw your consent for us to contact you for the purpose of collecting, using, or disclosing your data at any time by reaching out to us at: support@royalqueenseeds.com.

SECTION 3 – DISCLOSURE

We may disclose your personal information if we are required to do so by law or if you breach our Terms of Service.

SECTION 4 – HOW LONG DO WE KEEP YOUR DATA?

At Royal Queen Seeds, we will not retain your data for longer than is necessary for the purposes described in this Policy. Different retention periods apply for different types of data; however, the longest period we will normally hold any personal data is 10 years.

4.1 Account information

Data relating to the account remains relevant for as long as the consumer is in possession of an account. Therefore, the data remains documented for as long as the account exists. When our customers delete an account, the associated data will be deleted within a reasonable period of time. Requests regarding the inspection or correction of stored personal data or the deletion of an account can be sent to support@royalqueenseeds.com.

4.2 Newsletters

In the event that you give us your consent to inform you about our products or services, we will keep your data until you express your wish not to receive any further communications from us. However, we regularly (every month) carry out a relevance check. Registered customers (and their personal information) will be deleted whenever customers do not reply to our request. In addition, our newsletter mailing has an opt-out feature. Consumers can withdraw their consent by using this opt-out feature.

SECTION 5 – COOKIES

Cookies are small information files that notify your computer of previous interactions with our website. These cookies are stored on your hard drive, not on our website. Essentially, when you use our website, your computer displays its cookies to us, informing our site that you have visited before. This allows our website to function more quickly and remember aspects related to your previous visits (such as your username), making your experience more convenient. At Royal Queen Seeds, we use two types of cookies: functional and analytical.

5.1 Functional Cookies

Functional cookies are used to enhance your online experience. Among other things, these cookies track what is added to your shopping cart. The use of these cookies does not require prior authorization.

5.2 Analytical Cookies

Analytical cookies are used for research and market analysis. The data collected with these analytical cookies is anonymous, making it unusable for third parties. The use of these cookies does not require prior authorization.

SECTION 5 – THIRD-PARTY SERVICES

Third-party services are required to conduct transactions and provide our services. In general, the third-party providers we use will only collect, use and disclose your information to the extent necessary to enable them to perform the services they provide to us.

However, certain third-party service providers, such as payment gateways and other payment transaction processors, have their own privacy policies regarding the information we must provide to them for your transactions.

We encourage you to read the privacy policies of these providers so that you can understand how these providers will handle your personal information.

In particular, certain suppliers may be located or have facilities located in a different jurisdiction than yours or ours. Therefore, if you choose to proceed with a transaction involving the services of a third party, your information may be subject to the laws of the jurisdiction in which that service provider or its facilities are located.

Once you leave our website or are redirected to a third-party website or application, you are no longer governed by this Privacy Policy or the Terms of Service of our website.

Web analytics service (anonymous data)

On this website we have integrated an element of a web analytics service (with anonymisation functionality). Web analytics can be defined as the gathering, processing and analysis of data about the behaviour of visitors to websites. An analytics service collects, among other things, data about which website a person came from (the so-called referrer), which sub-pages they visited or how often and for how long they visited a sub-page. Web analytics is mainly used for website optimisation and for a cost–benefit analysis of internet advertising.

Courier service

To complete deliveries we use a courier service. This courier service carries out the delivery between our company and the consumer's home. To complete these logistics, the company requires access to the consumer's name and address information.

Mailing service

Royal Queen Seeds uses a third-party mail service provider to send its newsletter. This provider has access to limited account information related to opt-in consent (e.g. email address).

Marketing services

Royal Queen Seeds has the support of a company that specialises in marketing and communication activities. Their access to personal information is very limited and mostly anonymous.

Payment services

At Royal Queen Seeds we use external payment services to handle our transactions (e.g. credit card payments).

SECTION 6 – SECURITY

To protect your personal information, we take reasonable precautions and follow industry standard best practices to ensure that it is not inappropriately lost, misused, accessed, disclosed, altered or destroyed.

If you provide us with your credit card information, the information is encrypted using secure socket layer technology (SSL) and stored using AES-256 encryption. Although no method of transmission over the internet or electronic storage is 100% secure, we follow all PCI-DSS requirements and implement additional industry standards that are commonly accepted. Information related to the account is protected with a hashing method. This method transforms the information into a generated hash. As a result, confidential information is protected and invisible, even to us. In addition, our databases are exceptionally protected against unauthorised access. For example, access to the database is only possible and permitted via approved IP addresses (e.g. from Royal Queen Seeds headquarters). Other attempts and addresses are rejected at all times.

Furthermore, data is anonymised as much as possible, so it cannot be directly linked to a specific consumer. With this data, however, we may be able to carry out market research and analysis. In addition, the third parties concerned (e.g. mailing service) are examined prior to our collaboration, comply with the GDPR from the EU and receive a processing agreement. Within Royal Queen Seeds, employees are assigned different access permissions. Specific permission provides access only to information that is strictly required to perform a task. Digital security measures are subject to change and must meet high requirements to ensure the safety of online customers. That is why, at Royal Queen Seeds, we appoint a security officer. Regular verification and improvement of security measures (where necessary) are part of the role.

SECTION 7 – CHANGES TO THIS PRIVACY POLICY

We reserve the right to modify this Privacy Policy at any time, so please check back regularly. Changes and clarifications will be effective immediately upon being published on the Website. If we make substantial changes to this policy, we will notify you here that it has been updated so you will know what information we collect, how we use it and under what circumstances, if any, we use and/or disclose it.

SECTION 8 – YOU HAVE THE RIGHT TO: