Why do I need a sodium blood test?Your health care provider may have ordered a sodium blood test as part of your regular checkup or if you have symptoms of too much sodium (hypernatremia) or too little sodium (hyponatremia) in your blood.Symptoms of high sodium levels (hypernatremia) include:Excess thirstInfrequent urinationVomitingDiarrheaSymptoms of low sodium levels (hyponatremia) include:WeaknessFatigueConfusionMuscle twitching
