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Hopefully biological passports can detect those sorts of shenanigans.
My understanding, and at best I'm an armchair haematologist, is that if you consistently extract and re-infuse your blood all year round, then it'll escape detection from the biological passport, i.e. as long as your values are consistent it's hard to detect if you are blood doping.
It's when you top up with a transfusion of your own blood. Allegedly.