Read the thread about 10 times. Could you please just explain what you mean my this...

"What you probably didn't see is that because immunoassay is looking for 31 metabolites and GC/MS is looking for 1 metabolite, these levels correlate to pretty much the same thing."

Just a little confused. Does this mean that since they are looking for just on metabolite that the odds are about the same as finding the 31 in tin UI at under 50? I get everything else but this one doesn't make sense to me for some reason.