In order to get blood work done, in the vast majority of cases, it must be ordered by a physician. This can be either a regular primary care physician or a physician from an urgent care center. After they have established that a blood test is required for the diagnostic process, they will give the patient a blood work form that indicates the type of tests needed and what exactly they will be looking for in these tests. Although this may be performed in-office, in some cases the patient will need to go to a laboratory services clinic that regularly performs these tests. The actual procedure does not take very long and involves drawing a sample of blood (typically from the forearm) and testing it in their lab.