From:
http://www.cbc.ca/news/background/epo/
"EPO was such a concern leading up to the Sydney Olympics that officials quickly came up with a test for the hormone. The test involves both blood and urine samples. The blood test looks for high levels of immature red blood cells, indicating that a large amount of the cells were produced recently.
If the number of young blood cells in a sample is too high (the cut-off point is a guarded secret), the athlete's urine is then tested using sophisticated molecular fingerprinting techniques. The urine test is meant to tease out molecular markers present in synthetic EPO that do not occur in the natural hormone."
How about a three strikes rule? Fail the blood test, fail the urine test, 'crit over 50%, yer out! Really, if someone fails the urine test but has a 'crit of 45-49% I really don't see the problem because the EPO wouldn't be doing a very good job if the person's 'crit is still in the mid 40s.
Alan