What Does a “Dilute” Drug Test Result Mean? Creatinine, Specific Gravity, and Why Labs Flag Over-Dilution

Quick answer: A dilute result usually means the urine sample is less concentrated than expected. This can happen unintentionally. What happens next depends on the testing program’s policy.

Educational only. Not medical or legal advice. VerdantDetox does not provide instructions for cheating, tampering with, or evading drug tests.

Table of contents

What “dilute” means

A dilute result indicates the sample’s concentration is lower than expected. Programs that include specimen validity review commonly evaluate markers such as:

  • Creatinine
  • Specific gravity

Why labs check concentration markers

Low concentration can reduce confidence in the interpretation of screening results, especially near cutoffs. That’s why many programs define procedures for “negative-dilute” outcomes, retesting, or additional review.

Common reasons a sample becomes dilute

A dilute result is not proof of wrongdoing. It can occur due to:

  • High fluid intake for wellness reasons
  • Endurance exercise followed by rehydration
  • Timing (frequent urination before collection)
  • Anxiety-driven overhydration

What often happens next

Policies vary by employer and program. Common outcomes include:

  • Reported as negative-dilute
  • Requested recollection/retest under program rules
  • MRO review in certain regulated settings

For high-stakes situations, rely on the written policy and the collection site instructions.

FAQ

Is a dilute result the same as a positive?

No. “Dilute” refers to sample concentration. The program determines the report category and next steps.

Can a dilute result cause a retest?

Often yes, depending on policy. Some programs retest after negative-dilute or repeated dilute patterns.

References

Verdant Herbals