Because EPO is a natural hormone, in theory you can get away with using moderate amounts without needing to bypass the tests. Take bioidentical EPO before bed (

Because EPO is a natural hormone, in theory you can get away with using moderate amounts without needing to bypass the tests. Take bioidentical EPO before bed (possibly IV instead of IM for shorter detection time) and by the time you wake up it's hard to distinguish from natural variation. This is what the "biological passport" is designed to prevent but I'm not sure if it actually works