a typical person's blood has about 4g of salt
sodium
Two important electrolytes found in blood plasma are Na+ (sodium) and Cl- (chloride).
Electrolytes
electrolytes
Sodium is an element found in table salt (sodium chloride) and consuming too much salt in the diet can lead to high blood pressure. This is because the body retains water to dilute the excess sodium in the bloodstream, which can increase blood volume and pressure on the blood vessel walls.
Blood sodium testing is used to detect hyponatremia or hypernatremia associated with dehydration, edema, and a variety of diseases. a full explanation can be found here: http://www.labtestsonline.org/understanding/analytes/sodium/test.html
Sodium chloride, also known as table salt, is found dissolved in the plasma of the blood. It helps maintain the osmotic balance of the blood, which is essential for proper cell function and overall health.
electrolytes
Electrolytes
Sodium is a necessary nutrient; several cellular processes rely on it. However, as with most things, too much of it is bad for you. Probably the biggest concern is that too much sodium promotes hypertension -- high blood pressure. People who are otherwise prone to high blood pressure are often put on sodium-restricted diets.
too much sodium aka salt in their diet or to much sugar !!
It means that your body doesnt have much sodium in it. this can be good and bad check with your doctor.