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NCAA Athlete · 03-03-2006, 03:43 AM

I've heard that dilution doesn't work with GC/MS tests. Is this true?

(I hope it isn't)

Buzzby · 03-03-2006, 03:47 AM

It's not true. Drug tests are not zero tolerance. You have to have a certain concentration of THC metabolites in your urine in order to test positive. The thresholds for EMIT and GC/MS are effectively the same.

Hawg · 03-04-2006, 12:47 AM

Your Grandmother would show traces of drugs on a multi panel test, anyone would but like Buzzby said you have to consider the threshold/cutoff rate.

I am Mr.Crowley · 03-04-2006, 02:25 AM

Quote:

Originally Posted by Buzzby

The thresholds for EMIT and GC/MS are effectively the same.

Effectively the same???? not exactly, but close for sure,,the cuttoff for emit is 50 nanograms,,,the cuttoff for gas cromatic is a little lower,,10-20ng depending on the setting of the machine. obviously detects smaller amounts

thats why they use gc/ms as confirmation for positive emits

just thought you might want to know if you werent sure

GREAT JOB, GREAT FORUM,,always said the best on the net.

Good Day
Mr.Crowley

Buzzby · 03-04-2006, 02:50 AM

No. They are effectively the same.

The numbers are different but the GC/MS is testing for only the one primary THC metabolite. The EMIT and other immunoassay tests are sensitive to 30 (or 31) different THC metabolites, which is why the cutoff number is higher.

If you pass an EMIT, you'd pass the GC/MS (but they wouldn't bother). If you fail the EMIT they'll send a sample for GC/MS testing to eliminate a false positive. A 50 ng/ml cutoff on an immunoassay test is equivalent to a 15-20 ng/ml cutoff on a GC/MS.

I am Mr.Crowley · 03-04-2006, 03:08 AM

"The EMIT and other immunoassay tests are sensitive to 30 (or 31) different THC metabolites,"

Do you remember where you found this info? Seriously I would be very interested in reading it if you remember.

"the GC/MS is testing for only the one primary THC metabolite"

Exactly

Buzzby · 03-04-2006, 04:05 AM

Check out this post.

slosuenos · 03-07-2006, 10:12 AM

Buzzby, what you say in your first post in this thread seems contrary to what this site's FAQ says about the GC/MS test.

Forgive me if I'm mistaken or confused, but dilution does help with a GC/MS test?

Thanks,
SLOSuenos

Buzzby · 03-07-2006, 05:23 PM

Quote:

Originally Posted by slosuenos

Buzzby, what you say in your first post in this thread seems contrary to what this site's FAQ says about the GC/MS test.

Can you be more specific? If you would quote what you think is contradicted from the FAQ I'd be more able to give you an answer.

Quote:

Forgive me if I'm mistaken or confused, but dilution does help with a GC/MS test?

For any urine drug test to produce a positive, it requires a concentration of drug metabolites that is above a set threshold. Dilution techniques, which lower that concentration, are effective for all urine drug tests.

slosuenos · 03-07-2006, 09:04 PM

http://www.marijuana.com/2b.php3

2.6 Gas Chromatography / Mass Spectrometry: 2nd paragraph.

"Abstinence and substitution are the only ways to defeat the GC/MS test. "

From what I understand that you said, dilution should work on a GC/MS test also. I have a real stake in this, as my diluted sample is being GC/MS tested today...

Thanks again,

SloSuenos

03-03-2006, 03:43 AM	#1
NCAA Athlete New Member Join Date: Feb 2006 Posts: 24 Grams: 1,111.95 Groans: 0 Groaned at 0 Times in 0 Posts Thanks: 0 Thanked 0 Times in 0 Posts Stock Portfolio Total Value: 0.000 Gain/Loss: 0.000%	Differences between EMIT and GC/MS I've heard that dilution doesn't work with GC/MS tests. Is this true? (I hope it isn't)

03-03-2006, 03:47 AM	#2
Buzzby Buddhist Curmudgeon Join Date: Aug 2004 Posts: 14,462 Grams: 48,057.68 Groans: 37 Groaned at 49 Times in 41 Posts Thanks: 529 Thanked 3,917 Times in 1,942 Posts Stock Portfolio Total Value: 0.000 Gain/Loss: 0.000%	It's not true. Drug tests are not zero tolerance. You have to have a certain concentration of THC metabolites in your urine in order to test positive. The thresholds for EMIT and GC/MS are effectively the same. __________________ 60% of the people of America now say we are heading toward a depression. Not a recession, a depression. We are in desperate need of profitable industries that we can tax. Um... Now can we legalize pot? ~ Bill Maher Theocracy Watch

03-04-2006, 12:47 AM	#3
Hawg Sr. Member Join Date: Mar 2005 Posts: 1,594 Grams: 3,069.25 Groans: 1 Groaned at 0 Times in 0 Posts Thanks: 5 Thanked 4 Times in 4 Posts Stock Portfolio Total Value: 0.000 Gain/Loss: 0.000%	Your Grandmother would show traces of drugs on a multi panel test, anyone would but like Buzzby said you have to consider the threshold/cutoff rate. __________________ Here is a good place to see who test's and how. http://www.testclear.com/dtcompanies/searchcompany2.cfm Figures don't lie but liars can figure

03-04-2006, 03:08 AM	#6
I am Mr.Crowley New Member Join Date: Mar 2006 Posts: 6 Grams: 797.65 Groans: 0 Groaned at 0 Times in 0 Posts Thanks: 0 Thanked 0 Times in 0 Posts Stock Portfolio Total Value: 0.000 Gain/Loss: 0.000%	I gotch ya! "The EMIT and other immunoassay tests are sensitive to 30 (or 31) different THC metabolites," Do you remember where you found this info? Seriously I would be very interested in reading it if you remember. "the GC/MS is testing for only the one primary THC metabolite" Exactly

03-07-2006, 10:12 AM	#8
slosuenos New Member Join Date: Mar 2006 Posts: 12 Grams: 797.50 Groans: 0 Groaned at 0 Times in 0 Posts Thanks: 0 Thanked 0 Times in 0 Posts Stock Portfolio Total Value: 0.000 Gain/Loss: 0.000%	What? Buzzby, what you say in your first post in this thread seems contrary to what this site's FAQ says about the GC/MS test. Forgive me if I'm mistaken or confused, but dilution does help with a GC/MS test? Thanks, SLOSuenos

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03-04-2006, 02:50 AM	#5
Buzzby Buddhist Curmudgeon Join Date: Aug 2004 Posts: 14,462 Grams: 48,057.68 Groans: 37 Groaned at 49 Times in 41 Posts Thanks: 529 Thanked 3,917 Times in 1,942 Posts Stock Portfolio Total Value: 0.000 Gain/Loss: 0.000%	No. They are effectively the same. The numbers are different but the GC/MS is testing for only the one primary THC metabolite. The EMIT and other immunoassay tests are sensitive to 30 (or 31) different THC metabolites, which is why the cutoff number is higher. If you pass an EMIT, you'd pass the GC/MS (but they wouldn't bother). If you fail the EMIT they'll send a sample for GC/MS testing to eliminate a false positive. A 50 ng/ml cutoff on an immunoassay test is equivalent to a 15-20 ng/ml cutoff on a GC/MS.

03-04-2006, 04:05 AM	#7
Buzzby Buddhist Curmudgeon Join Date: Aug 2004 Posts: 14,462 Grams: 48,057.68 Groans: 37 Groaned at 49 Times in 41 Posts Thanks: 529 Thanked 3,917 Times in 1,942 Posts Stock Portfolio Total Value: 0.000 Gain/Loss: 0.000%	Check out this post.

03-07-2006, 09:04 PM	#10
slosuenos New Member Join Date: Mar 2006 Posts: 12 Grams: 797.50 Groans: 0 Groaned at 0 Times in 0 Posts Thanks: 0 Thanked 0 Times in 0 Posts Stock Portfolio Total Value: 0.000 Gain/Loss: 0.000%	Dilution to beat GC/MS tests http://www.marijuana.com/2b.php3 2.6 Gas Chromatography / Mass Spectrometry: 2nd paragraph. "Abstinence and substitution are the only ways to defeat the GC/MS test. " From what I understand that you said, dilution should work on a GC/MS test also. I have a real stake in this, as my diluted sample is being GC/MS tested today... Thanks again, SloSuenos

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