david samadi. >> good morning. >> some of the tests you really should have when necessary? we've got a list of them. blood pressure screening, cholesterol and thyroid screening. why should you have those? >> blood pressure is very important because it's a silent killer and you want to make sure your blood pressure is usually around 120 over 80. if your blood pressure is high, you want to make sure that you repeat it at least a couple more times before you really make sure that you have it. the reason is because heart disease and stroke, these are silent killers and you want to know what your blood pressure is. our biggest problem in this country is the high consumption of salt. we're consuming about 3500 milligrams of salt. we should be around 2500 milligrams. if you're a diabetic, have kidney disease you want to go to 1500. check your blood pressure around the age of 20 every year. cholesterol is important because that is another risk for heart disease and coronary artery disease et cetera. your cholesterol level should be less than 200. start checking it at the age of 20