There are many different types of blood test. Your doctor will decide which tests you need. Blood tests can check:
- the number of different blood cells – white blood cells, red blood cells and platelets you have in your blood (blood count)
- how organs such as your liver and kidneys are working
- for abnormal levels of proteins, called tumour markers.
- the levels of other substances in the blood that may be linked with certain types of cancer
A phlebotomist, nurse or doctor will take a sample of blood, usually from a vein in your arm. This will then be tested in a laboratory.