The only way to find out if your blood pressure responds to sodium is by changing the amount you eat - there is no test that will reveal whether you are salt-sensitive. However, experts believe genetic make-up may be a primary factor, and research may make it possible to test for salt sensitivity in the future. Until then, if you have hypertension, try to consume 1,500 mg of salt or less a day and see if it affects your blood pressure.
One positive aspect of having salt-sensitive hypertension is that modifying your diet may mean you need fewer medications. Some people require as many as four or five medications to get their blood pressure under control.