A blood test is an examination of a blood sample taken from a prick on the finger or through a vein in certain body parts, such as an arm using a needle. Blood test aims to detect disease, find out the function of organs, detect poisons, drugs, or certain substances, and check the overall health condition. After the blood sample is taken, the blood sample is put into a special small bottle and then taken to the laboratory. In this place, blood samples will be examined under a microscope or tested with chemicals, depending on the type and purpose of the blood test. Why Blood Test? Blood flows throughout the body, acting as a medium that carries nutrients and oxygen to tissues and all cells. Blood also carries waste products back to the excretion system for disposal. Blood flow in the body affects or is affected by many medical conditions. For this reason, a blood test is one of the most common tests to do. Some other reasons why blood tests are done are as a way to monitor the ac...