In mild cases, low blood sodium or hyponatraemia can be treated if the person suffering from the illness makes adjustments to their diet. More severe cases of hyponatraemia are treated by administering electrolytes and fluids intravenously, according to WebMD. People with severe or acute hyponatraemia may also need certain medications in order to manage the symptoms associated with low levels of sodium in the blood.
Hyponatraemia is diagnosed by taking a blood sample and then measuring the amount of sodium in the blood, According to WebMD. Once a person is diagnosed with hyponatraemia, a doctor will examine their past medical history and order further blood or urine tests in order to determine the cause of the persons low blood sodium levels.