Each life insurance carrier sets its own standards for what types of things that are tested for when it comes to blood testing for a life insurance policy.
If you have answered all of the questions on the application truthfully that were asked there will more than likely be no change or problem with your life insurance policy being issued as long as you have met the insurance company's requirements for issue.
Some of the things they look for when testing your blood may include marijuana, cocaine, methamphetamine, HIV/Aids, STD's, diabetes, high cholesterol, high protein levels, etc.
In addition, there are companies that offer life insurance without any blood testing required.