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DOT Testing Guide

How to Check Your DOT Drug Test Results

DOT drug test results go through a certified Medical Review Officer before they're reported. Here's the timeline, what each result means, and how to access your results.

Access Employer Portal Call (888) 233-4567
24–48 hrs
Lab preliminary result
1–3 days
MRO review & verification
Same day
Final result reported to employer
How It Works

The DOT Drug Test Result Process

DOT drug tests are federally regulated under 49 CFR Part 40. Results don't go directly from the lab to you or your employer — they must be reviewed and certified by a Medical Review Officer (MRO) first. This protects donors from false positives and ensures compliance with federal law.

1

Specimen collected at a certified site

Urine specimen is collected under direct observation protocols (for observed collections) and sealed in a tamper-evident chain-of-custody kit. Specimen ID and chain-of-custody form (CCF) are completed.

Day 0
2

Specimen shipped to a SAMHSA-certified laboratory

The specimen is shipped overnight to an HHS/SAMHSA-certified laboratory. The lab tests for the 5-panel DOT substances: marijuana metabolites (THC-COOH), cocaine metabolites, opioids, amphetamines, and phencyclidine (PCP).

Day 0–1
3

Laboratory reports result to the MRO

The lab issues a preliminary result — negative, non-negative, or invalid — to the MRO within 24 to 48 hours of receiving the specimen. The lab never reports directly to employers.

Day 1–2
4

MRO reviews and verifies the result

For negative results, the MRO verifies and reports to the employer immediately — usually within hours of receiving the lab result. For non-negative results, the MRO contacts the donor for a medical interview before issuing a final result.

Day 1–3
5

Final result reported to employer / DER

The MRO issues the final verified result to the employer's Designated Employer Representative (DER) or the C/TPA managing the program. Employers can view results in the WorkOccMed portal.

Result available
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Non-negative results take longer

If the laboratory finds a non-negative result, the MRO must reach the donor by phone for a medical interview before issuing a final result. The MRO makes three contact attempts over 24 hours. If the donor cannot be reached, the MRO contacts the DER. This can add 1–3 business days to the process.

Result Types

What Each DOT Drug Test Result Means

The MRO issues one of several possible final results. Here's what each one means:

Final Result
Negative
No prohibited substances detected at or above the federal cutoff levels. The donor is cleared for safety-sensitive duties. This is the most common result.
Final Result
Positive
A prohibited substance was confirmed at or above cutoff levels AND the MRO determined there is no legitimate medical explanation. The donor is immediately removed from safety-sensitive duties.
Preliminary / Under Review
Non-Negative
Lab found a substance requiring MRO review. Not a final result. The MRO will interview the donor before issuing a Positive or Negative final result.

Other Possible Results

Negative-Dilute: The specimen was negative but diluted (low creatinine). Depending on the employer's policy, a second collection may be required.

Refusal to Test: If the donor refuses to provide a specimen, adulterates or substitutes the specimen, or refuses the MRO interview, the MRO reports a refusal — which is treated the same as a positive result under DOT regulations.

Invalid: The specimen could not be tested. The employer must direct an immediate re-collection.

Cancelled: Testing was cancelled due to a fatal flaw in the collection or chain-of-custody process. The employer must direct an immediate re-collection (no adverse action against the donor).

Accessing Your Results

How to Check Your Results

Where you access your results depends on who ordered the test.

📋

Ordered through WorkOccMed?

Employers and designated employer representatives (DERs) can view all test results in the WorkOccMed employer portal. Results appear as soon as the MRO certifies them — typically within 1 to 3 business days of collection.

Log In to Employer Portal →
⚠

Individual donors: contact the MRO directly

If you were tested as an employee (not the employer ordering the test), your results go to your employer's DER — not directly to you. You have the right under 49 CFR Part 40 to request a copy of your results from the MRO. Call us at (888) 233-4567 and we can connect you with the MRO on record.

If the MRO Calls You

If your result is non-negative, the MRO's office will contact you by phone. Always return these calls promptly. The MRO needs to give you an opportunity to explain any legitimate medical reason for the result — such as a valid prescription — before a final result is issued. If you miss three attempts over 24 hours, the MRO will report a positive result without your input.

The MRO is a licensed physician and this conversation is confidential. They are required by law to consider your explanation before issuing a final result.

Frequently Asked Questions

DOT Drug Test Results — FAQ

A negative DOT drug test result is typically available within 24 to 72 hours after specimen collection. The laboratory completes initial testing within 24 hours; the MRO reviews and certifies negative results usually within 1 business day of receiving them from the lab. Non-negative results take longer because the MRO must contact the donor first — expect 3 to 5 business days total for a final non-negative or positive result.
Yes. Under 49 CFR Part 40, you have the right to request a copy of your drug test result from the MRO. If you tested through WorkOccMed, call us at (888) 233-4567 and we'll connect you with the MRO. Employers receive results through the portal at portal.dot-physical.net.
Non-negative is a preliminary laboratory finding — not a final result. It means the lab detected something that requires MRO review before a final result can be issued. The MRO will call you to discuss any legitimate medical explanation (e.g., a valid prescription). After the interview, the MRO issues a final result of either Negative (if a medical explanation is accepted) or Positive (if not). Non-negative does not automatically mean you failed the test.
Laboratory errors are extremely rare at SAMHSA-certified labs. However, you have the right to request a split specimen retest if you believe your positive result is wrong. Under 49 CFR Part 40.187, you have 72 hours from notification of a positive result to request that the split specimen (Bottle B) be sent to a second SAMHSA-certified lab for re-testing. If the split specimen test is negative, the MRO must report the result as cancelled.
A verified positive DOT drug test result requires immediate removal from safety-sensitive duties. You cannot return to a safety-sensitive position until you complete the DOT Return to Duty process: evaluation by a DOT-qualified Substance Abuse Professional (SAP), completion of any recommended treatment or education, a negative return-to-duty drug test, and a follow-up testing program of at least 6 unannounced tests in the first 12 months.
No. Under DOT regulations, the MRO is the only authorized person to receive the laboratory result and report a final result to the employer. The employer does not see the lab's preliminary result — only the MRO's final verified result. This protects donors from false positives reaching employers before the MRO review is complete.
Employer accounts can view all results in the WorkOccMed portal at portal.dot-physical.net. Log in, navigate to your orders, and check the status column. Results appear as soon as the MRO certifies them. If you have questions about a specific result, call us at (888) 233-4567.

Need to Order a DOT Drug Test?

Order online for yourself or your employees. Results reported through our secure portal within 1 to 3 business days.

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