ATTENTION HOUSE 1 PCV. PCV is your "packed cell volume". It is a test done to measure the number of red blood cells in your body. The work of the red blood cells is to carry oxygen from the air you inhale int your lungs and deliver it to all parts of your body. If your PCV is low, oxygen delivery to your baby will be low too and your baby will not get enough oxygen to attain its maximum growth potential and hence will be very small by the time you give birth to him or her. So for this reason, at any point in time, your doctor does not want your PCV to be less than 30%. If your PCV is less than 30%, we doctors call it "Anemia" in pregnancy.