a possible cause of this is the accelerated metabolism of glucose during pregnancy , which leads to an improvement in carbohydrate tolerance and thus lowers the hb-a1 level , or the increased erythropoetic activity of the bone marrow during the second trimester , leading to a `` '' thinning '' '' and thus a reduction of the hb-a1 concentration due to the increased volume of erythrocytes .
C0032961
pregnancy
C0032980
second trimester