na (sodium, serum)
ElectrolyteBlood sampleResults 24 hrsNo fasting
Na (Sodium, Serum)
Sodium is a key electrolyte that controls your body's fluid balance and supports nerve and muscle function. This test measures your blood sodium level to assess hydration and overall balance.
Sample
Blood
Results
24 hrs
Fasting
Not required
Follow-up
Optional add-on
What this test detects
Sodium
Ion-selective electrode · serum
Quantitative · mmol/L
When to get this test
Hydration and fluid balance
Helps detect dehydration or fluid overload that can shift sodium levels.
Kidney and adrenal function
Supports evaluation of conditions affecting how the body holds onto or loses sodium and water.
Electrolyte assessment
Routinely checked with other electrolytes to give a complete picture.
How to prepare
01
No special preparation needed.
Common questions
What causes abnormal sodium levels?
Sodium imbalances can come from dehydration, excess fluids, kidney issues, or hormonal conditions. The result is best read together with your symptoms and other tests.
Does drinking water affect my sodium?
Hydration status influences sodium levels, since sodium and water balance are closely linked. Significant over- or under-hydration can change your reading.