Quick answer
LSD (acid) is typically detectable in urine for ~1 day (8–24 h typical; 2–5 days mega-dose edge cases) after any use. It is not part of standard employment panels.
Not screened on standard employment panels.
Typical cutoff: Specialized assays only (urine ~0.5–1 ng/mL OEO-LSD markers); not commercially standard.
Detection window by test type
| urine | |
|---|---|
| Any use | ~1 day (8–24 h typical; 2–5 days mega-dose edge cases) |
| saliva | |
| Any use | ~8–12 hours (research) |
| hair | |
| theoretical | 90 days; commercial availability rare |
| blood | |
| Any use | ~12 hours |
Ranges reflect typical published detection windows and vary with dose, frequency, body composition, hydration and the assay used.
Key details
LSD is absent from every standard employment panel. Microgram dosing means metabolite concentrations plunge below instrument limits within a day — testing for it reliably is technically hard and expensive.
Only forensic/research settings order LSD-specific testing; HR screening never does.
The 'spinal fluid stays forever' folklore is false — clearance is rapid.
False positives & cross-reactivity
- Historic screen-level cross-reactivity with psilocin and some SSRIs on research immunoassays; irrelevant to standard panels.
Frequently asked questions
How long does lsd (acid) stay in your system?
In urine, typical detection is ~1 day (8–24 h typical; 2–5 days mega-dose edge cases) (any use). Hair can detect use for up to 90 days and saliva/blood windows are usually shorter.
Will lsd (acid) show up on a standard drug test?
No — LSD (acid) is not part of the standard 5-, 10- or 12-panel or DOT tests. It would require a specialised or expanded assay.
Can anything cause a false positive for lsd (acid)?
Historic screen-level cross-reactivity with psilocin and some SSRIs on research immunoassays; irrelevant to standard panels.
How accurate are these detection windows?
They are typical ranges from published literature and assay documentation, not guarantees. Clearance depends on dose, frequency, metabolism and the specific test cutoff used.
Related substances
Cite this page
DrugPanels. “LSD (acid) Detection Time.” https://drugpanels.com/detection/lsd/. Accessed 2026-09-10.
Sources
- Dolder PC et al., LSD pharmacokinetics, Clinical Pharmacokinetics — Clinical Pharmacokinetics / PubMed — pubmed.ncbi.nlm.nih.gov
- SAMHSA drug testing resources and analyte specifications — Substance Abuse and Mental Health Services Administration — samhsa.gov
Detection windows describe typical ranges from the published literature and assay documentation; individual results vary. See our methodology.