Specimen Validity Guide
What Does a Dilute Urine Drug Test Mean?
A dilute specimen generally means the urine has relatively low concentrations of the normal components labs use to check concentration. Possible reasons include high fluid intake, normal variation, medical circumstances or collection timing. A dilute result does not automatically prove intentional tampering.
Quick answer
What Does Dilute Mean?
- Urine has relatively low concentrations of normal components used to check concentration.
- Reasons can include fluid intake, normal variation, medical circumstances or collection timing.
- A dilute result does not automatically prove tampering.
- What happens next depends on lab and program rules.
What happens next
Dilute Result: What Happens Next?
Flow from specimen collection to validity check, classification, review and response.
Specimen collected
Specimen validity measures
Lab classification
Program / provider reviews result
Legal or clinical response depends on governing rules
How labs check
How Specimen Validity Is Assessed
Labs measure markers of urine concentration. Each lab and program sets how those measures are classified.
Causes
Why a Specimen May Be Dilute
- High fluid intake
- Normal physiological variation
- Medical circumstances
- Collection timing
- Other factors
Federal workplace testing standard
Federal Workplace Criteria Are Not Universal
Federal workplace testing, such as under 49 CFR Part 40, defines specimen-validity criteria. Those thresholds do not automatically control California court, probation, diversion or private programs.
Next steps
How Programs May Respond
Programs may request a new specimen, observed collection or other steps under their rules. The legal meaning, if any, is for counsel and the court. Discuss medical factors with a qualified clinician.
Legal note
A dilute result is a lab classification, not a legal finding. Defense counsel handles legal consequences; the court decides.
What ETS can and cannot do
Where Executive Treatment Solutions Fits
ETS is not a laboratory. ETS coordinates testing and keeps authorized records organized.
Responsibilities
Who Does What?
Laboratory
Measures validity and classifies the specimen.
Qualified clinician
Reviews medical factors.
Defense counsel
Addresses legal meaning.
Court
Decides legal consequences.
ETS
Coordinates testing and records.
Questions
Dilute Urine Tests: Frequently Asked Questions
Sources & Legal References
Federal workplace testing standard (reference only — not court rules)
Confidential consultation
Organized Testing Support
ETS can coordinate testing and authorized records.
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