Section 40.89 - What are the adulterant cutoff concentrations for initial and confirmation urine tests?(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.65 FR 79526, Dec. 19, 2000, as amended at 66 FR 41951, Aug. 9, 2001; 73 FR 35970, June 25, 2008 73 FR 35970, 6/25/2008; 88 FR 27643, 6/1/2023