Na
The primary extracellular electrolyte — tightly regulated by kidneys and hormones.
What is it
Sodium is the main electrolyte in extracellular fluid and is essential to fluid balance, nerve function, and blood pressure regulation.
Why it's measured
Sodium levels have been used in clinical evaluation of hydration, kidney function, and hormonal balance in research and practice.
Reference range
Standard laboratory reference
136 – 145 mEq/L
Reference ranges vary by laboratory. Your individual reference range will appear on your test report and should be interpreted by your physician in the context of your overall health profile.
What results may indicate
Elevated
Has been associated with dehydration and certain endocrine conditions in research literature.
Lower
Has been associated with overhydration, kidney issues, and certain medications in research literature.
These associations are general. They are not a personal diagnosis or prediction. Discuss your individual results with your physician in the context of your full health profile.
When it's measured
Part of standard electrolyte panels.
Related markers
Measured in
A complete look at your heart, hormones, metabolism, inflammation, and longevity systems — drawn at Quest or LabCorp, reviewed by a U.S.-licensed physician.
Explore the Apex Panel →This information is for general educational purposes only and is not medical advice. Lab results alone are not intended to diagnose, treat, or cure any condition and do not replace the advice of a healthcare provider. OPTML does not offer medical advice, a diagnosis, medical treatment, or any form of medical opinion.