Quote Originally Posted by Burnt Toast
The GC/MS isnt used to check the creatinine, pH, amd S/G anyway. Different methodologies are used to check these constituents. The GC/MS is only used for drug metabolites and two types of adulterants (pyridine and glutaraldehyde).

A rundown of the methodologies are found in the link posted in post #10 of this thread:
http://boards.cannabis.com/drug-test...-about-qf.html
Great information, I learned something new today. thx..