Sodium and Glucose in Serum (Plasma) Concentration

What This Test Measures

The test evaluates two key substances: sodium, an electrolyte critical for fluid balance and nerve function, and glucose, the primary energy source for your body. Sodium levels help determine if you’re retaining or losing too much fluid, while glucose levels indicate how your body processes sugar.

Why It Matters in Your Health

Abnormal sodium levels may signal dehydration, kidney issues, or conditions like hyperaldosteronism. Elevated glucose could point to undiagnosed diabetes or insulin resistance, while low levels might suggest severe dehydration or metabolic disorders.

Common Reasons for Testing

Doctors may order this test if you have symptoms like excessive thirst, confusion, fatigue, frequent urination, or unexplained weight changes. It’s also used in monitoring chronic conditions like heart failure, kidney disease, or diabetes.

Sample Collection and Preparation

A blood sample is drawn from a vein, usually in your arm. The blood is processed to separate plasma or serum for testing. You may be asked to fast before the test if glucose levels are being specifically measured, but sodium levels are generally tested on any blood sample.