Select section:

If you take GHB/GBL, will it show up on a drug test?

GHB and GBL are usually tested for using hair, urine, saliva (spit) or blood. However, these drugs may not be tested for often as they can only be picked up on in a very short window (1–2 days) and can be unreliable.

GHB and GBL testing windows can change depending on how much you have taken, how often and your individual body. However, it is thought that GHB and GBL can be found for 12 hours in urine and 8 hours in blood – these are the most accurate tests. Saliva tests detect GHB and GBL for up to 6 hours but are mostly used as a secondary test after a urine sample. Hair sample tests can detect GHB and GBL for up to 30 days, but they are not very reliable.

If you believe you have been given GHB or GBL without your consent (sometimes called getting ‘roofied’), you may be asked to have a test to see if it is in your system. If you have been given these drugs without your knowing and are expecting a drug test for work or court, you can speak to a medical professional or Police about your next steps.

At some time in your life, an employer, a family member or the government may ask you to take a drug test. It’s important to understand what drug tests can detect and what might happen if you fail one.

If you fail a drug test, this may affect your employment, government support, court cases or official licences or registrations. At work, you may face legal consequences, especially if you have put the safety of others at risk.

Related stories

High-minded: how mental health can affect your high

For Mental Health Awareness Week, we talked to Phil Glaser, one of the team behind The Level, about how your state of mind has a bigger impact on your trip than you might think.

Now I'm 33

This experience was shared by a member of Rewired - a support group for men who have sex with men and use methamphetamine, run by the NZ Aids Foundation and NZ Drug Foundation.

Calling an ambulance during lockdown - advice from a paramedic

Wondering what happens if you need an ambulance during lockdown? Blake Murray from St John answers your questions.

Find another drug