Carbon dioxide is a pure substance. A pure substance can be an element or a compound. Carbon dioxide is a pure compound, consisting of two kinds of atoms that are bonded together. An element consists of merely one kind of atom. For example, oxygen is an element.
For Downâs syndrome, a blood test called the quadruple test is available from weeks 14-20 of pregnancy. For Patauâs and Edwardsâ syndromes, you will be offered a mid-pregnancy scan that checks for physical abnormalities.
Anemia during pregnancy can make you feel weak and tired. Know the risk factors, symptoms and what you can do to avoid it. If you're pregnant, you're at an increased risk of iron deficiency anemia, a condition in which you don't have enough healthy red blood cells to carry adequate oxygen to your tissues.Understand why anemia during pregnancy occurs and what you can do about it.ou are at increased risk of developing anemia during pregnancy if you: 1  Have two or more closely spaced pregnancies. 2  Are pregnant with more than one baby. 3  Are vomiting frequently due to morning sickness. 4  Don't consume enough iron. 5  Have a heavy pre-pregnancy menstrual flow.