Decreased Q2 carrying capacity and Normal PO2 is a feature of :

Subnormal level of hemoglobin causes decreased oxygen – carrying capacity of the blood. This in turn initiates compensatory physiologic adaptations such as : o Increased release of oxygen from hemoglobin. o Increased blood flow to the tissues. o Maintenance of the blood volume ; and o Redistribution of blood flow to maintain the cerebral blood supply. o Eventually, however, tissue hypoxia develops causing impaired functions of the affected tissues.