NBME 5 Question help
So there is an elderly pt who comes in with shortness of breath and has smoked 2 packs of cigarettes for a long time.. his oxygen saturation is 84% (normal is 95-98).. the pts inability to maintain adequate tissue oxygenation will most likely lead to increased production of which of the following in his erythrocytes?
I narrowed it down to 2 answer choices..
- 2,3-BPG (the correct answer)
- EPO (my answer)
I see why 2,3-BPG is correct, but I do not understand why it wouldn't be EPO.. Isn't the pt hypoxic? I thought hypoxia leads to EPO production.. I am missing a very simple concept here and would love someone to clarify for me, thanks!