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@dubtap
Here's a example of biopassport readings over last season published by Chris Horner to show he wasn't blood doping at the Giro, even though the results seem to strongly indicate he was. And he's just stupid.
If your haemaglobin levels drop then suddenly rise, or hardly drop during a GT whilst your baby blood cell count (Reticulocytes) behave in a way suggesting new blood cells have been introduced to your system, you're probably doping.
Likewise if your haemaglobin drops above or below the upper or lower limits they set for your passport based on measurements over time, that get your file flagged.
So the trick with micro dosing seems to be to be able to keep your blood metrics within the upper and lower limits and also to have no suspicious patterns of readings within those limits.