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booradley · 05-30-2006, 06:34 PM

OK..This one is probably for SEC3 too....

The results come back as a ratio of metabolite to Parts per Million. A
ppm over 1.0 is a fail for THC. Does that estimate require the clinician to measure/weigh, the sample? How does the lab know volume of the hair being tested so that they can come back with a ratio? If they cut a length that "typically" results in a known mass of hair, then are thicker hairs disadvantaged? By extension, then, are thinner hairs advantaged? this way? Is this why they thinner hairs seem to have a better pass rate than thicker hair? Or caucasion smoker's hair a better pass rate than black smoker's hair?

Thanks in advance

damf · 05-30-2006, 08:29 PM

Mine came back 1.6...so is that still a long way from passing. I figured it would be a lot higher (see other post). I did this test on my own last Thursday, got results today. Have to do the real thing this Friday!!!

1tokeovertheline · 05-30-2006, 10:54 PM

Quote:

Originally Posted by booradley

OK..This one is probably for SEC3 too....

The results come back as a ratio of metabolite to Parts per Million. A
ppm over 1.0 is a fail for THC. Does that estimate require the clinician to measure/weigh, the sample? How does the lab know volume of the hair being tested so that they can come back with a ratio? If they cut a length that "typically" results in a known mass of hair, then are thicker hairs disadvantaged? By extension, then, are thinner hairs advantaged? this way? Is this why they thinner hairs seem to have a better pass rate than thicker hair? Or caucasion smoker's hair a better pass rate than black smoker's hair?

Thanks in advance

According to Pysco-medics, it is a "fair" test and nobody is at a disadvantage.

05-30-2006, 06:34 PM	#1
booradley New Member Join Date: May 2006 Posts: 4 Grams: 796.90 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%	Parts Per Million Question - Lab Procedures OK..This one is probably for SEC3 too.... The results come back as a ratio of metabolite to Parts per Million. A ppm over 1.0 is a fail for THC. Does that estimate require the clinician to measure/weigh, the sample? How does the lab know volume of the hair being tested so that they can come back with a ratio? If they cut a length that "typically" results in a known mass of hair, then are thicker hairs disadvantaged? By extension, then, are thinner hairs advantaged? this way? Is this why they thinner hairs seem to have a better pass rate than thicker hair? Or caucasion smoker's hair a better pass rate than black smoker's hair? Thanks in advance

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05-30-2006, 08:29 PM	#2
damf New Member Join Date: May 2006 Posts: 7 Grams: 695.35 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%	Mine came back 1.6...so is that still a long way from passing. I figured it would be a lot higher (see other post). I did this test on my own last Thursday, got results today. Have to do the real thing this Friday!!!

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