How Long Does THC Stay In Urine
Interpret specimen, cutoff, confirmation and medical-review status without promising a drug-test pass date. Sensitive inputs stay in your browser.
A drug test is a specimen-specific measurement against a defined method and cutoff. SAMHSA guidance does not support converting a broad internet detection range into a guaranteed negative date.
Context matters.
- Do not use this page to time drug use, defeat a test or decide that driving, work, medication use or another safety-sensitive activity is safe.
- An initial non-negative screen may require confirmatory testing and review. A reported negative means the analyte was not reported at or above that test's cutoff; it is not proof of no exposure or no impairment.
- For a clinical result, discuss the exact laboratory report with the treating clinician. For a regulated workplace result, use the program's Medical Review Officer and challenge / retest process.
Sources & scope
The calculation guide and this source trail show what the result means, where the rule came from and when it was last reviewed. This is source-and-calculation QA, not a claim of medical, legal, tax or other professional review; time-sensitive decisions still belong with the linked authority.
A visible path from input to answer.
Interpret specimen, cutoff, confirmation and medical-review status without promising a drug-test pass date. The page keeps the calculation scope and its limits beside the result so the output can be checked, copied or revisited.
- Read the record. The calculator uses Drug / metabolite named on the order, Specimen collection date, Specimen, Test context and Current result stage and 3 additional fields supplied in the form.
- Apply the scope. It applies the United States drug-test interpretation — SAMHSA specimen, cutoff, confirmation and medical-review framework; no pass-date prediction reference and the explicit date, unit and counting conventions shown in the result.
- Expose the checkpoints. Intermediate rows, warnings and timeline events stay visible; the emphasized row identifies the primary checkpoint when one exists.
A drug test is a specimen-specific measurement against a defined method and cutoff. SAMHSA guidance does not support converting a broad internet detection range into a guaranteed negative date.
- Panel / cutoff / methodNot documented
- Medical reviewNot available / not arranged
- Predicted negative dateNot calculated
Calculation purpose: Interpret specimen, cutoff, confirmation and medical-review status without promising a drug-test pass date. This is a high-sensitivity reference output; the linked authority or qualified professional controls the final decision.
Calendar inputs use plain year-month-day semantics. Leap days, month ends, date-pair order and unsupported dates are checked before the result is shown.
Rule set 2.0.0 · Last reviewed 2026-08-22 · Next review due 2027-02-22. The source panel below contains the linked evidence.
What to know before using the result.
Can this tool tell me the date I will pass a drug test?
No. A defensible interpretation requires the exact specimen, analyte, cutoff, collection procedure and confirmation method. CalcSpan intentionally does not generate a pass date.
Does a negative result prove there was no prior use?
No. It means the reported analyte was not detected at or above the method's cutoff in that specimen. Timing, specimen quality and the substances included in the panel still matter.
Is an initial non-negative result final?
Not necessarily. Workplace and clinical programs can require laboratory confirmation and medical review before a final interpretation, including review of legitimate medication context.