what is a sodium test
Results. A sodium test checks how much sodium (an electrolyte and a mineral) is in the blood. The normal values listed hereâcalled a reference rangeâare just a guide. These ranges vary from lab to lab, and your lab may have a different range for what's normal.esults. A sodium test checks how much sodium (an electrolyte and a mineral) is in the blood. The normal values listed hereâcalled a reference rangeâare just a guide. These ranges vary from lab to lab, and your lab may have a different range for what's normal.