Don’t use any substances that would trigger a positive result
Avoid all drug use immediately
Use only prescribed medications as directed by a clinician
Check the exact test type and cutoff level (THC, amphetamines, cocaine, opioids, etc.)
If you take legal medication, confirm it won’t cross-react with the panel you’re testing for
Do not attempt adulterants (they can cause an invalid/failed test)
Hydrate normally; don’t overhydrate
Eat regular meals; don’t fast or binge
Get adequate sleep and avoid heavy exercise right before the test
If you have a prescription, bring documentation to the testing site if allowed
Ask the testing provider about retesting or medical review policies
If you can choose the timing, schedule the test as late as possible within the rules and policies
If you’re unsure, contact the testing lab or your employer’s HR for the medical review process