Which potassium values are considered critical?

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Multiple Choice

Which potassium values are considered critical?

Potassium levels are tightly controlled because they strongly influence heart rhythm and muscle function. Values that are considered critical are those that indicate an immediate danger to life: serum potassium below 2.5 mmol/L or above 6.0 mmol/L. At these extremes, the risk of dangerous arrhythmias and severe weakness increases quickly, so urgent assessment and management are required. Normal potassium typically sits around 3.5 to 5.0 mmol/L (sometimes up to about 5.5), and values within or near this range are not considered immediately life-threatening. Other ranges stay outside the normal but don’t carry the same immediate risk, which is why they aren’t labeled as critical.

Potassium levels are tightly controlled because they strongly influence heart rhythm and muscle function. Values that are considered critical are those that indicate an immediate danger to life: serum potassium below 2.5 mmol/L or above 6.0 mmol/L. At these extremes, the risk of dangerous arrhythmias and severe weakness increases quickly, so urgent assessment and management are required. Normal potassium typically sits around 3.5 to 5.0 mmol/L (sometimes up to about 5.5), and values within or near this range are not considered immediately life-threatening. Other ranges stay outside the normal but don’t carry the same immediate risk, which is why they aren’t labeled as critical.

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