Sodium is a substance that the body needs to work properly.
Sodium is found in most foods. The most common form of sodium is
sodium chloride, which is table salt. A test can be done to see
how much sodium is in your blood. How the test is performed A
blood sample is needed. For information on how this is done,
see: Venipuncture How to prepare for the test Many medicines can
interfere with sodium blood test results. Your health care
provider will tell you if you need to stop taking any medicines
before you have this test. Do not stop or change your
medications without talking to your doctor first. How the test
will feel When the needle is inserted to draw blood, some people
feel moderate pain, while others feel only a prick or stinging
sensation. Afterward, there may be some throbbing. Your blood
sodium level represents a balance between the sodium and water
in the food and drinks you consume and the amount in urine. A
small amount is lost through stool and sweat. Many things can
affect this balance. Your doct