Which value is considered a normal serum potassium level?

The normal serum potassium level is typically between 3.5 to 5.0 mEq per L, making a value of 4 mEq per L fall well within this normal range. Potassium is a crucial electrolyte involved in numerous physiological processes, notably in cardiac function, muscle contraction, and nerve conduction. Maintaining the correct potassium levels is vital, as both low levels (hypokalemia) and high levels (hyperkalemia) can have significant consequences on health, particularly in a pediatric population where the impact on cardiac rhythm can be exceptionally critical.

Values such as 2 mEq per L and 3 mEq per L are below the normal range, indicating potential hypokalemia, which can lead to symptoms such as muscle weakness, cramps, and arrhythmias. A value of 5 mEq per L is on the upper limit of normal but is often still considered acceptable. However, anything above this threshold may raise concerns regarding hyperkalemia and its associated risks, especially in emergency situations. Thus, the selection of 4 mEq per L as a normal serum potassium level aligns with standard clinical references and guidelines.