Blood tests help doctors check for certain diseases and conditions. They also help check the function of your organs and show how well treatments are working.
Specifically, blood tests can help doctors:
- Evaluate how well organs—such as the kidneys, liver, thyroid, and heart—are working
- Diagnose diseases and conditions such as cancer, HIV/AIDS, diabetes, anemia, and heart disease
- Find out whether you have risk factors for heart disease
- Check whether medicines you're taking are working
- Assess how well your blood is clotting
Blood tests have few risks. Most complications are minor and go away shortly after the tests are done.