Do you commonly observe acute erythrocytosis in patients with ILD flares being treated with supplemental oxygen and high-dose corticosteroids?  

Assuming that this patient does not have erythrocytosis at baseline, my experience is that acute erythrocytosis is not typical. Erythrocytosis caused by hypoxemia typically has a lag of several weeks, even though EPO increases within 48 hours. You commonly see a moderate acute leukocytosis with high...