The CEA test measures the level of carcinoembryonic antigen (CEA) in the blood.CEA is a protein normally found in the tissue of a developing baby in the womb. The blood level of this protein disappears or becomes very low after birth.he CEA test measures the level of carcinoembryonic antigen (CEA) in the blood.
Blood is made up of cells in a watery base, called plasma. There are three major types of cells blood made up of â red blood cells (RBCs), while blood cells (WBCs) and platelets. 1  They are also known as erythrocytes, carry oxygen to various parts of the body.  They are the most in number, constituting about 40-45% of blood. Their structure is like that of dough nuts.
Like the red and white blood cells, platelets are produced in bone marrow from stem cells. Plasma. Plasma is the relatively clear, yellow tinted water (92+%), sugar, fat, protein and salt solution which carries the red cells, white cells, and platelets. Normally, 55% of our blood's volume is made up of plasma. As the heart pumps blood to cells throughout the body, plasma brings nourishment to them and removes the waste products of metabolism. Plasma also contains blood clotting factors, sugars, lipids, vitamins, minerals, hormones, enzymes, antibodies, and other proteins.