<prompt> All of the following changes may be observed in a normal pregnancy, EXCEPT:Increase in blood viscosityFall in serum iron concentrationIncrease in serum iron binding capacityIncrease in blood oxygen carrying capacity  <response>: During pregnancy there is a dispropoionate increase in plasma and RBC volume which produces a state of hemodilution during pregnancy. During pregnancy plasma volume increases upto 50. RBC volume increases to the extend of 20-30. The advantages of hemodilution are: Diminished blood viscosity ensures optimum gaseous exchange between the maternal and fetal circulation. Protection of mother against the adverse effects of blood loss during delivery. Ref: Textbook of Obstetrics By D.C. Dutta, 6th edition, Pages 51-55 