§FMCSR.com
Current textSource: eCFR

§ 40.181 What does the second laboratory do with the split specimen when it is tested to reconfirm a substituted test result?

Current wording, effective June 1, 2023.

eCFR (current) ↗
What changedOct. 1, 2001 wording → June 1, 2023 wording (current)+21 added−27 removedHide

As the laboratory testing thea urine split specimen, you must test the split specimen using the criteriaconfirmatory oftests § 40.93(b), just as you would do for acreatinine primaryand specimen.specific Thegravity, resultusing of the primarycriteria specimenset isforth reconfirmedin if§ the40.88.
[88 splitFR specimen27646, meetsMay these2, criteria.2023]

49 CFR § 40.181 — What does the second laboratory do with the split specimen when it is tested to reconfirm a substituted test result?. Text current through October 22, 2026. This wording effective June 1, 2023 to present. Source: eCFR (current), https://www.ecfr.gov/current/title-49/section-40.181. Retrieved from FMCSR.com, https://fmcsr.com/reg/40.181, on October 26, 2026. Unofficial compilation; verify against the official source.

As the laboratory testing a urine split specimen, you must test the split specimen using the confirmatory tests for creatinine and specific gravity, using the criteria set forth in § 40.88.

[88 FR 27646, May 2, 2023]

Amendment history

4 distinct wordings on file since Oct. 1, 2001
  1. June 1, 2023 → presenteCFR, day-precisediff vs. previousviewing
    [88 FR 27646, May 2, 2023]
  2. May 2, 2023 → June 1, 2023eCFR, day-precisediff vs. previous
    [73 FR 35973, June 25, 2008]
  3. Oct. 1, 2008 → May 2, 2023annual editions 2008–2016diff vs. previous
    [73 FR 35973, June 25, 2008]
  4. Oct. 1, 2001 → Oct. 1, 2008annual editions 2001–2007

A new entry appears whenever the regulatory words change between government snapshots. Day-precise from the eCFR (2017 onward); before that, one snapshot per annual CFR edition (revised as of October 1). Bracketed citations are the Federal Register history printed with the section. Set a case date in the header to read any earlier wording.