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 if the creatinine concentration is less than 20 mg/dL and the specific gravity 

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is less than 1.003, unless the criteria for a substituted specimen are met.

    (b) As a laboratory you must consider the primary specimen to be substituted if the creatinine concentration is less than or equal to 5 mg/dL and the specific gravity is less than or equal to 1.001 or greater than or equal to 1.020.