[Code of Federal Regulations]

[Title 49, Volume 1]

[Revised as of October 1, 2005]

From the U.S. Government Printing Office via GPO Access

[CITE: 49CFR40.93]



[Page 652-653]

 

                        TITLE 49--TRANSPORTATION

 

          Subtitle A--Office of the Secretary of Transportation

 

PART 40_PROCEDURES FOR TRANSPORTATION WORKPLACE DRUG AND ALCOHOL TESTING 

PROGRAMS--Table of Contents

 

                   Subpart F_Drug Testing Laboratories

 

Sec. 40.93  What criteria do laboratories use to establish that a 

specimen is dilute or substituted?



    (a) As a laboratory, you must consider the primary specimen to be 

dilute when:

    (1) The creatinine concentration is greater than or equal to 2 mg/dL 

but less than 20 mg/dL, and

    (2) The specific gravity is greater than 1.0010 but less than 1.0030 

on a single aliquot.

    (b) As a laboratory, you must consider the primary specimen to be 

substituted when the creatinine concentration is less than 2 mg/dL and 

the specific gravity is less than or equal to



[[Page 653]]



1.0010 or greater than or equal to 1.0200 on both the initial and 

confirmatory creatinine tests and on both the initial and confirmatory 

specific gravity tests on two separate aliquots.



[69 FR 64867, Nov. 9, 2004]