Why It Is Done. A phenylketonuria (PKU) screening test is done to see whether a newborn baby has the enzyme needed to use phenylalanine in his or her body. If this test shows that your baby has a phenylalanine problem, the doctor will do further testing to check whether your baby has PKU.he blood sample for PKU is usually taken from your baby's heel (called a heel stick). The test is done in the first few days after birth, as early as 24 hours after birth.
Add image to my collection. Technology to inject drugs into the body is a recent development. Hypodermic syringes (hypodermic means âbeneath the skinâ) consist of a hollow needle attached to a syringe. They pierce the skin and inject substances into the bloodstream. They are also used to extract liquid such as blood from the body.
A hypodermic needle (from Greek á½ÏÎ¿- (under-), and Î´Î­ÏÎ¼Î± (skin)) is a hollow needle commonly used with a syringe to inject substances into the body or extract fluids from it.They may also be used to take liquid samples from the body, for example taking blood from a vein in venipuncture.arge bore hypodermic intervention is especially useful in catastrophic blood loss or shock. A hypodermic needle is used for rapid delivery of liquids, or when the injected substance cannot be ingested, either because it would not be absorbed (as with insulin), or because it would harm the liver.