# What are the adulterant cutoff concentrations for initial and confirmation urine tests?

**Citation:** 49 CFR 40.89  
**Type / status:** regulation / current  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** 2026-08-18  
**Published:** Not stated

(a) As a laboratory, you must use the cutoff concentrations for the initial and confirmation adulterant testing as required by the HHS Mandatory Guidelines and you must use two separate aliquots—one for the initial test and another for the confirmation test.

(b) As a laboratory, you must report res

## Document text

(a) As a laboratory, you must use the cutoff concentrations for the initial and confirmation adulterant testing as required by the HHS Mandatory Guidelines and you must use two separate aliquots—one for the initial test and another for the confirmation test.

(b) As a laboratory, you must report results at or above the cutoffs (or for pH, at or above or below the values, as appropriate) as adulterated and provide the numerical value that supports the adulterated result.

[73 FR 35970, June 25, 2008. Redesignated at 88 FR 27643, May 2, 2023]

## Provenance

- Official: Yes
- Source: <https://www.ecfr.gov/on/2026-08-18/title-49/section-40.89>
- Source ID: `ecfr`
- SHA-256: `eac02106afd26d5fb5860d3a4bbc9b3337a63a46d5267ee6f3a92ca45e30b2d1`
- Retrieved: 2026-08-20T05:54:21.729Z
- Exported: 2026-08-24T01:09:39.175Z
- Document slug: `49-cfr-40-89`

### Source metadata

```json
{
  "cfrTitle": 49,
  "part": "40",
  "section": "40.89",
  "subpart": "Subpart F—Drug Testing Laboratories",
  "corpusVersion": "2026-08-18",
  "jurisdiction": "US"
}
```