Following are the major steps to carry out blood test.
Step 1 - A small prick is made using a pin or syringe needle to get a blood drop.
Step 2 - This blood drop is taken on a glass slab as a sample for testing.
Step 3 - The sample is then observed under a microscope.
By observing a blood sample under a microscope, doctors can find the exact disease the person is suffering from.