Hyponatremia sets in when sodium falls below what concentration?

Hyponatremia is defined as a condition where the sodium concentration in the blood falls below a certain threshold, leading to imbalances that can cause various health complications. The correct answer highlights that hyponatremia sets in when sodium levels drop below 135 millimolar.

This threshold is significant because sodium plays a crucial role in maintaining fluid balance, nerve function, and muscle contraction. When sodium levels fall below 135 millimolar, it indicates that the body's sodium concentration is insufficient to support these vital functions, which can lead to symptoms ranging from mild (like headache and fatigue) to severe (such as confusion, seizures, or even coma).

Sodium levels above this threshold, such as 140 or even 130 millimolar, are considered normal and indicate no deficiency. Recognizing the 135 millimolar mark helps in identifying individuals who may need medical assistance to address their electrolyte imbalance effectively. Understanding these thresholds is critical for nutrition coaches to help clients manage their health and dietary needs appropriately.