Blood tests are an invaluable diagnostic tool in the medical profession, and can reveal many, many things that are going on with the patient, some of which are:
- high white blood cell count, which shows infection in the body
- low red cell blood count, which can indicate iron deficiency, anemia, etc.
- some pregnancy tests in doctors offices and hospitals use blood tests
- tests for HIV and AIDS
- tests for leukemia
- many, many different hormone levels are diagnosed with blood tests
