Best diagnostic test to measure<unk> , serum sodium < 135 mEq/L, is direct ion-specific electrode potentiometry. Other tests are associated with false results in certain conditions.
Different etiologies of<unk>  are differentiated based on serum osmolality, urine osmolality, and urine sodium.
To see the different caused of<unk> , click here.
Hyponatremia diagnostic study of choice
Hyperkalemia diagnostic study of choice
Hypoglycemia other diagnostic studies
Hyponatremia other diagnostic studies
Metabolic alkalosis diagnostic study of choice
Hypoglycemia echocardiography or ultrasound
Metabolic alkalosis other diagnostic studies
Metabolic acidosis differential diagnosis