From that Wikipedia article:
"...the Andean highlanders, ... show different pattern of haemoglobin adaptation. Their haemoglobin concentration is higher compared to those of lowlander population, which also happens to normal people moving to high altitude. When they spend some weeks in the lowland their heamoglobin drops to average of other people. This shows only temporary and reversible acclimatisation. However, in contrast to lowland people, they do have increased oxygen level in their haemoglobin, that is, more oxygen per blood volume than other people. This confers an ability to carry more oxygen in each red blood cell, making a more effective transport of oxygen in their body..."
I have no idea 1) if this is correct (it being Wikipedia) and 2) exactly how this fits with the blood passport stuff.
"...the Andean highlanders, ... show different pattern of haemoglobin adaptation. Their haemoglobin concentration is higher compared to those of lowlander population, which also happens to normal people moving to high altitude. When they spend some weeks in the lowland their heamoglobin drops to average of other people. This shows only temporary and reversible acclimatisation. However, in contrast to lowland people, they do have increased oxygen level in their haemoglobin, that is, more oxygen per blood volume than other people. This confers an ability to carry more oxygen in each red blood cell, making a more effective transport of oxygen in their body..."
I have no idea 1) if this is correct (it being Wikipedia) and 2) exactly how this fits with the blood passport stuff.