What is the threshold critical value for low plasma potassium?

The threshold critical value for low plasma potassium, also known as hypokalemia, is recognized as 2.5 mmol/L. This level is significant because it corresponds to the point where clinical symptoms and physiological complications may arise, necessitating prompt medical attention. At this critical threshold, patients may experience various issues such as cardiac arrhythmias, muscle weakness, and impaired renal function due to the vital role of potassium in cellular function and neuromuscular transmission. Monitoring and managing potassium levels is essential in clinical practice to prevent potentially life-threatening outcomes. Values below this threshold indicate a severe deficiency that warrants immediate intervention.