What should you know about urine toxicology tests?

The test may be used when a clinician needs information about recent exposure to a medicine, recreational drug, or substance that could affect alertness or breathing. A screening result can identify a substance group, while a confirmatory test may be needed to identify a specific substance more precisely. Detection depends on the substance, the test method, timing, dose, kidney function, and how the sample was stored. A positive result does not by itself prove impairment, dependence, or the exact time of use. Some prescribed medicines and products can affect screening results, so share a complete medication and supplement list.

Follow the collection instructions and provide the sample in the container supplied. Tell the clinician about prescribed medicines, non-prescription products, supplements, and any difficulty providing a sample. Do not stop a prescribed medicine to change a result. If the test is part of an assessment for a urinary problem, the clinician may also recommend a standard [Urine Test](/treatments/diagnostics-and-screening/urine-test/) to look for blood, protein, inflammation, or infection. Treatment decisions should consider your symptoms and examination, not a laboratory result alone.

Seek urgent medical help for severe sleepiness, confusion, slow or difficult breathing, blue or grey lips, a seizure, chest pain, or sudden collapse after taking or being exposed to a substance. These signs need immediate assessment regardless of whether a urine result is available. Fever with pain in the side or back, vomiting, or feeling very unwell may need prompt review for a urinary infection such as [Kidney Infection](/conditions/kidney-infection/).

Ask which substances the test includes, whether it is a screening or confirmatory test, how medicines may affect interpretation, and when the result will be discussed. You can also ask what symptoms would require treatment for a [Urinary Tract Infection](/conditions/urinary-tract-infection/) rather than testing alone.