The Sodium Serum test is one of the most fundamental and critical electrolyte tests. Sodium is essential for maintaining your body's fluid balance, as well as for proper nerve and muscle function. This simple blood test is a core part of our Electrolyte Panel and is vital for assessing hydration, kidney function, and metabolic balance. An imbalance can cause serious symptoms. This is a non-negotiable check on your body's most basic operating system, ensuring your core 'wiring' is in perfect order.