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It states in much literature that long time chronic users that it can take from 4 and up to 6 weeks. That being said, how can you be sure that a lab does not also check for metabolites since these "may" be present in the urine. I need a toxicologist to answer this question as so very much is on the line. Check out www.aitlabs.com. This lab is no joke. Look under the pain management and the toxicology etc. I really want a toxicologist. Thank you so much though Camille for your help it was appreciated. This is a very intricate and difficult question that needs a toxicolgist only. Thanks again
First of all, drug screens don't tell quantities of anything. The screens are designed so that a certain level will trigger a positive reaction. Once there is a positive reaction, the sample is supposed to be sent to the lab for confirmation testing via GC/MS (gas chromatography/mass spectrophotometry) which can detect an exact level. The GC/MS positive level is lower than the screening level because the equipment is a lot more accurate. Still, the lab isn't concerned about your exact level unless it has been ordered for confirmation of your use of a prescription drug. For an employment drug screen, for instance, it is still reported either "negative" or "positive." Once the Medical Review Officer from the lab contacts you and is confident you have a prescription for whatever is found in the sample, the report to the employer is still listed as "negative."
If this is a test required by your provider to confirm that you are taking the two drugs prescribed, then you need to know that the metabolic rate of each person is different and they really will not be able to determine level of metabolites from the clonazepam you took 3.5 to 4 weeks ago versus those you took last week. Clonazepam has huge variation in elimination half-life which makes absolute tracking of when you took your medication unfeasible. If you are taking the current clonazepam according to directions, you will be fine.