In addition, the blood tests may uncover the use of tobacco and marijuana, as well as, other illegal substances, such as, cocaine, methamphetamine, and other drugs.
Aside from this, the life insurance company will also test for HIV, hepatitis, cholesterol and other lipids, immune disorders and prostate specific antigens. The blood screening tests will also sometimes look for the presence of medications, and other substances in your body.
If your blood test shows positive results for the presence of any of the above in your blood, the life insurance company may deny your application for coverage or may charge you with higher premium rates based on your health.
To learn more, review this article that explains life insurance blood testing and how it works.