A blood test is when a sample of blood is taken for testing in a laboratory. Blood tests have a wide range of uses and are one of the most common types of medical test.
A blood test can be used to:
- assess your general state of health
- confirm or aid diagnosis
- see how well certain organs, such as the liver and kidneys, are functioning
A blood test usually involves the phlebotomist taking a blood sample from a blood vessel in your arm usually inside of the elbow or wrist, where the veins are relatively close to the surface.