Drug test info – test types, detection times and interpretation of results
Drug test information helps you choose the right test for the situation and interpret the result correctly. A rapid test provides practical information within minutes about whether a sample contains a tested substance or metabolite at or above the test’s cut-off level.
Testerit’s range includes urine and saliva tests as well as tests for surfaces, materials and substances. Products are available for home use, companies, educational institutions, sports clubs and professional users. Choose the test according to the sample type, substances to be screened and intended use.
Check out the range of drug tests
Drug test info: how does a drug test work?
The rapid drug test is based on an immunochemical reaction. The test detects a specific substance or its metabolite in a sample. Depending on the test, the result is usually ready in a few minutes, so the situation can be quickly assessed at the place where the testing takes place.
The rapid test is a qualitative screening test. It tells you whether the concentration of the sample is below or above the specified limit value of the test. It does not measure the exact amount of the substance and does not alone indicate the time of use or the possible state of intoxication.
Choose a drug test according to the type of sample and situation
Different drug tests answer slightly different questions. A urine test can usually be used for a longer period of time than a saliva test, whereas in a surface and material test, the sample does not come from a person at all. Therefore, you should choose the sample type according to what you want to find out with the testing.
Urine test – wide range and longer detection time
A urine test is a common drug-screening method. It usually detects metabolites that can remain in urine longer than the substance itself remains in blood or saliva. A urine test is therefore well suited when you want to screen for use during the past few days.
Single-substance tests and multi-drug screenings are available as urine tests. A multi-panel test is a practical option when the substance to be tested is not known in advance or you want to check several groups of substances with the same sample.
Saliva test – for assessing more recent use
The saliva test is particularly suitable for screening for more recent use. Sampling is quick, easy to monitor and can be done without a separate toilet facility. Saliva tests are used, for example, at workplaces and in other situations where the result is needed quickly.
The detection time of saliva is usually shorter than that of urine. Therefore, saliva and urine tests do not replace each other, but answer slightly different questions.
Surface, material and substance tests
The surface and material test can be used to examine suspicious residues on surfaces, textiles, powders, tablets and suitable liquids. The sample does not come from a person, so the test is suitable for situations where you want to find out whether the material found contains substances to be tested.
Read more about the drug test for powders and surface swabs
Blood, hair and sweat tests
A blood sample is used, for example, when more detailed information is needed about the substances in the body at the time of sampling. A hair test can describe use over a longer period of time, and a sweat test can be used for more continuous monitoring. These methods complement rapid testing, but they are usually used in specific situations and through a service provider.
What can rapid drug tests be used for?
The advantage of rapid tests is speed and flexibility. When the purpose of the test, how it works and the processing of the result have been thought out in advance, the test helps to make consistent decisions that support safety.
| Situation | How can the rapid test be used? | Suitable test type |
|---|---|---|
| Home and caregivers | Investigating the situation, supporting and monitoring | Multi-drug urine screening or substance-specific test |
| Workplace | Pre-arranged screening, occupational safety assessment and documentation | Professional urine or saliva test |
| Educational institution | Screening in accordance with the operating model, when the conditions are met and the practices have been communicated | Test suitable for the situation and procedure |
| Sports Club | Support for pre-agreed substance abuse or anti-doping policies | Urine or saliva test, depending on the purpose |
| Professional use | Quick initial screening and assessment | CE-marked professional test according to the intended use |
| Surfaces and materials | Initial identification | Surface, material or substance test |
Always use the test in accordance with its user manual and stated purpose. Testerit’s range includes products for both home and professional use. Check the intended use and product-specific information before ordering.
You can read more about testing practices, consent, and testing at workplaces, educational institutions, sports clubs and families in the article Who is allowed to take a drug test.
Drug test info and interpretation of results
Always check the instructions for use of the test in question for the time it takes to read the result and the meaning of the lines. In many rapid drug tests, the result works in the opposite way than, for example, in a pregnancy test: two lines mean a negative result and only a control line means a preliminary positive result.
Negative result
A negative result means that no amount of the test substance or its metabolite was detected in excess of the test limit. A faint test line is also usually interpreted as negative if it appears within the reading time specified in the instructions for use.
Preliminary positive result
A preliminary positive result means that the concentration of the sample reaches or exceeds the limit value of the test. The result can be recorded on a test or reporting form and processed in accordance with a pre-agreed procedure. If the result is needed for official decision-making or the rules of the use situation require it, further examination is carried out using a separate, appropriate method.
Invalid result
If the control line does not appear, the test has not worked correctly. Common causes include an insufficient sample, an error during testing or storage outside the conditions stated in the instructions. Repeat the test with a new device.
Detection times of drug tests
The detection time refers to the period during which a substance or its metabolite can be detected by a given test. The times are indicative as they are affected by, for example, the substance, the amount and frequency of use, the type of sample, metabolism, the concentration of the sample and the limit value of the test.
| Substance group | Urine | Saliva |
|---|---|---|
| Amphetamines and methamphetamine | Typically a few days | Typically about 1–2 days |
| Cannabis | From individual use for a few days, in regular use clearly longer | Often from hours to about a day, in regular use for longer |
| Cocaine | Typically a few days | Often less than a day |
| Opioids | Often approximately 2–4 days, depending on the substance | Often less than a day |
| Benzodiazepines | From a few days to longer, depending on the medication and pattern of use | Often less than a day |
For example, regular cannabis use can show up in the urine for significantly longer than a single use. See the Alcohol and Drug Foundation’s detection time table for urine and saliva tests.
Detection time is not the same as duration of effect. A positive urine result may indicate previous use, even if the intoxicating effect of the substance has already ended. Therefore, the time of testing should be chosen according to whether you want to assess more recent use or a longer observation window.
Which drug test should you choose?
This drug test guide helps you understand which type of test is suitable for your situation. The choice is primarily influenced by the substances to be tested, the type of sample and how recent or previous use you want information to be.
- When the substance to be tested is unknown: choose a multi-drug screen that examines several groups of substances.
- When you want to screen for use during the past few days: a urine test is usually the most suitable.
- When you want to emphasize more recent use: choose a saliva test.
- Once a specific substance is known: a substance-specific test is a clear and cost-effective option.
- When examining a powder, tablet, liquid or surface: choose a surface and material test.
- When the test is used in an organization: make sure that the product is intended for that purpose and that the testing procedure has been agreed in advance.
Compare drug tests and choose a suitable test
Frequently asked questions about drug tests
Can I take a drug test myself?
Yes. The test for home use can be done by yourself according to the instructions for use. The test for professional use is suitable for screening carried out by a trained user in accordance with the purpose of use of the product and the operating model of the organisation.
How quickly is the result of the rapid test ready?
Depending on the test, the result is usually ready in about 5–10 minutes. The exact reading time is always in the product’s user manual. The result should not be interpreted after the stated time.
Can medication affect the result?
Some medications or their metabolites may react with a specific test panel. It is advisable to take into account the medications in use and check the product’s instructions for use for possible cross-reactions.
Can a negative result completely rule out use?
A negative result indicates that no amount exceeding the limit value of the test was detected in the sample in question. If the test is performed too early or too late in relation to use, the sample is very diluted or the test panel does not contain the substance in question, the result may be negative. If necessary, the test can be repeated at a suitable time or a different sample type can be selected.
Why is a multi-drug screening often a good first choice?
The multi-drug screen examines several common substance groups with the same sample. It makes it easier to understand the situation when the substance used is not known for sure, and the results of different panels are obtained during the same testing session.
Choose the right drug test for the situation
The easiest way to find the right test is to answer three questions: which substances do you want to study, how recent information is needed on use, and whether the test is carried out at home or in professional use. The product pages indicate the substances to be tested, the type of sample, limit values, the time of the result and the purpose of use.
This guide provides a practical basis for choosing the right type of drug test. More detailed information can always be found on the product page and user manual of the product in question.
