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CalcSpan/Drug-testing and exposure windows/Substance Detection Window Calculator/Thc
Preselected calculator · substance

Substance Detection Window Calculator
Thc.

Thc is applied to the real calculator input below. Review the visible assumptions and source scope, then adjust any details that differ from your situation.

Preselected valueThcInterpret specimen, cutoff, confirmation and medical-review status without promising a drug-test pass date. Sensitive inputs stay in your browser. Verify important decisions with a qualified professional.
Browse substancecannabisnicotinecaffeineamphetaminecocaineopioidbenzodiazepinealcoholthcmdmamethamphetaminepsilocybinkratomgeneral
Preselected reference valueThcThis value is applied to the real calculator input. Adjust the remaining assumptions and verify the visible source before relying on the result.
Reference calculation

Enter your details.

Calculated locally. This page loads no analytics and uploads no inputs.

Do not substitute a drug class for the laboratory analyte
Thu, Aug 27, 2026

Plain-date semantics · start date is not counted unless the result explicitly says inclusive.

Your result
Get the exact panel, analyte and cutoff

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.

Why this result
Named analytethc
Collection dateAug 27, 2026
SpecimenUrineDifferent specimens and collection methods are not interchangeable
Test contextClinical care
Panel / cutoff / methodNot documentedA detection claim cannot be interpreted without these details
Result stagePending / not collected
Medical reviewNot available / not arranged
Medication / exposure contextNo relevant prescribed medicine identified
Predicted negative dateNot calculatedDose, frequency, metabolism, analyte, specimen, collection quality and cutoff prevent a reliable individual pass-date prediction

Read before relying

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.
Rule set 2.0.0

Sources & scope

Source & calculation QA reviewed

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.

SAMHSA · SRC-SAMHSA-DRUG-001Clinical Drug Testing in Primary Care (TAP 32)Source retrieved 2026-08-20SAMHSA / HHS · SRC-SAMHSA-ORAL-FLUID-001Workplace Drug Testing Resources — current urine and oral-fluid guidanceSource retrieved 2026-08-22FTC · SRC-FTC-HEALTH-001Mobile Health Apps Interactive ToolSource retrieved 2026-08-19
JurisdictionUnited States drug-test interpretation — SAMHSA specimen, cutoff, confirmation and medical-review framework; no pass-date prediction
Last reviewed2026-08-22
Next review due2027-02-22
Review scopeCalcSpan source & calculation QA
PrivacySensitive input stays local