The sodium blood test measures the concentration of sodium in the blood. Sodium can also be measured using a urine test. Blood is drawn from a vein (venipuncture), usually from the inside of the elbow or the back of the hand.
The sodium blood test measures the concentration of sodium in the blood. Sodium can also be measured using a urine test. Blood is drawn from a vein (venipuncture), usually from the inside of the elbow or the back of the hand.
