Quote Originally Posted by Burnt Toast
Actually Web, the GC/MS is not used to check creatinine levels. The GC/MS is used only to confirm drug positives and two types of adulterants: Pyridine and Glutaraldehyde. Creatinine levels are checked using colorimetry (the typical validity dipstick/cup/cassette) while Refractometry is used for checking the specific gravity. Colorimetry can also be used for SG as the initial analysis.

Source: http://www.workplace.samhsa.gov/Drug...ary%202005.pdf
LOL that's what we need you BT... my stoned posts after 2 straight 16 hours shifts the ER are not always spot on Thanks for the correction.