MedTox Lab Test. Help?

[Burnt Toast]

thanks a lot for the info.
do you know if water is/can be considered a sample adulteration or substitution? or if the lab can distinguish between a person drinking excess water or adding water to their sample? i'm trying to get an idea of what result i could expect back after pouring some water into a lab sample to dilute it.

Drinking large amounts of water leads to the sample being ruled "diluted" due to the creatinine level dropping below 20 mg/dL. A urine sample with a creatinine level between 2 - 20 mg is ruled diluted. Creatinine levels less than 2 mg are ruled "substituted" (aka "not consistant with human urine"). Adding water to a urine sample can easily cause the creatinine to nosedive to this range so watch your step. Under DHHS and DOT regulations, a retest under direct observation is in order if the creatinine level is between 2 - 5 mg