Historical textIn force on Sept. 30, 2014Source: annual CFR editions 2008–2016

§ 40.96 What criteria do laboratories use to establish that a specimen is invalid?

Wording first on file in the 2008 annual edition, superseded May 2, 2023.

govinfo, 2013 edition ↗

Compare with

Before Jan. 1, 2017 the record is one snapshot per annual CFR edition, revised as of October 1. This is the 2013 edition's wording. An amendment that took effect between Oct. 1, 2013 and Sept. 30, 2014 would not appear until the next edition, so check the citations below and the Federal Register for exact effective dates.

49 CFR § 40.96 — What criteria do laboratories use to establish that a specimen is invalid?. Text in force on September 30, 2014. This wording effective October 1, 2008 to May 2, 2023. Source: govinfo, 2013 edition, https://www.govinfo.gov/app/details/CFR-2013-title49-vol1/CFR-2013-title49-vol1-sec40-96. Retrieved from FMCSR.com, https://fmcsr.com/reg/40.96?asof=2014-09-30, on October 26, 2026. Unofficial compilation; verify against the official source.

(a) As a laboratory, you must use the invalid test result criteria for the initial and confirmation 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, for a specimen having an invalid result for one of the reasons outlined in the HHS Mandatory Guidelines, you must contact the MRO to discuss whether sending the specimen to another HHS certified laboratory for testing would be useful in being able to report a positive or adulterated result.

(c) As a laboratory, you must report invalid results in accordance with the invalid test result criteria as required by the HHS Guidelines and provide the numerical value that supports the invalid result, where appropriate, such as pH.

(d) As a laboratory, you must report the reason a test result is invalid.

[73 FR 35970, June 25, 2008]

Amendment history

2 distinct wordings on file since Oct. 1, 2008

May 2, 2023 → June 1, 2023eCFR, day-precisediff vs. previous
[73 FR 35970, June 25, 2008]
Oct. 1, 2008 → May 2, 2023annual editions 2008–2016viewing
[73 FR 35970, June 25, 2008]

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.