What does the medical abbreviation Na plus mean?

The medical abbreviation "Na+" stands for "sodium ion." Sodium is an essential mineral for the human body and is involved in various physiological functions, including fluid balance, muscle contraction, and nerve transmission. An imbalance in sodium levels can lead to health problems such as dehydration, hyponatremia (low sodium levels), or hypernatremia (high sodium levels). The concentration of sodium ions in the blood is often measured as part of routine blood tests to assess overall electrolyte balance.