Abnormally low level of potassium in the blood.

Abnormally low potassium concentration in the blood. It may result from potassium loss by renal secretion or by the gastrointestinal route, as by vomiting or diarrhea. It may be manifested clinically by neuromuscular disorders ranging from weakness to paralysis, by electrocardiographic abnormalities (depression of the T wave and elevation of the U wave), by renal disease, and by gastrointestinal disorders. (Dorland, 27th ed)

An abnormally decreased potassium concentration in the blood.

Lower than normal levels of potassium in the circulating blood.

A disorder characterized by laboratory test results that indicate a low concentration of potassium in the blood.

Hypokalemia is serum potassium concentration < 3.5 mEq/L (< 3.5 mmol/L) caused by a deficit in total body potassium stores or abnormal movement of potassium into cells. The most common cause is excess loss from the kidneys or gastrointestinal tract. Clinical features include muscle weakness and polyuria; cardiac hyperexcitability may...

Hypokalemia is generally defined as a serum potassium level of less than 3.5 mEq/L (3.