Because you dont need two different products to measure hormone levels? If that logic was true they would sell separate tests for each drug.[/QUOTE
obvious copy and paste from someone smarter than i..
Although other testing methods do exist, there are four basic methods of testing urine in an employee drug screen in the U.S.. In order to determine what is or isn't (or what can or can't be) tested for in a urinalysis, one needs to know which method of testing will be used. These methods are:
-Test strip or stick
-Immunoassay analysis (EMIT, FPIA, RIA)
-Gas chromatography/mass spectrometry (GC/MS). and
-High performance liquid chromatography (HPLC)
In the U.S., labs often test for the following:
Drug metabolites, pH, creatinine, specific gravity, certain oxidants, and excessive nitrites (none of these determine sex). Testing for anything else is not economical and in the average employers best interest. However there are always exceptions, such as the military or government jobs that require a security clearance.
Using Radioimmunoassay (RIA) to test for the sex of the 'donor' by testing for the presence of hormones, as well as testing for Human Glycoprotein Immunoglobulin G (IgG) to determine if the urine is human or synthetic, is rarely done in the U.S. In fact, some labs won't run any additional tests other than metabolites (such as creatinine or specific gravity), unless there is a reason to believe that the sample has been tainted or diluted, or the employer specifically requests it.
If the sample is collected at and sent to a lab by a third party company or lab, one can easily enquire about the exact testing method and what they will test for. GC/MS and HPLC will provide more accurate results with a broader range of tests, as opposed to EMIT(II) and test strips or sticks, which almost never test for anything but the presence of the metabolite to give a positive or a negative.
Read more:
http://www.drugs-forum.com/forum/showthread.php?t=95329#ixzz2kaFBEets