yirg said:The actual testing method "is a real bugaboo," said Dr. John
McKinlay, the senior vice president and chief scientist at the New
England Research Institute who directs the Massachusetts Male Aging
Study, which follows men and measures testosterone levels, among other
things, as they age. Some methods are fraught with errors.
Even WADA agrees with this. Go to
http://www.wada-ama.org/rtecontent/document/end_steroids_aug_04.pdf
and download the WADA technical bulletin for steroid testing. Among the
interesting disclaimers you'll find in it:
"...it may not always be possible to measure epitestosterone
precisely."
"It should be borne in mind that there is significant variation between
individuals. A normal level for one individual may in another be
elevated and be consistent with doping."
"The concentration of urinary steroids such as testosterone and
epitestosterone varies greatly between individuals and also depends
upon the specific gravity of the urine."