General Information
Potassium (K) Is the main electrolyte (cation) and an important component of the intracellular buffer system. 90% of potassium is concentrated inside the cell and only a small amount is present in the extracellular space. The vast majority of potassium (90%) is in ionic form, the rest is associated with proteins.
Potassium plays an important role in physiological processes of muscle contraction, functional activity of the heart, conduction of nerve impulses, enzymatic processes, metabolism, maintenance of acid-base balance, osmotic pressure, protein anabolism and glycogen formation. Anabolic processes are accompanied by K+ fixation in the cell, and catabolic processes are accompanied by its release.
When should we take the test?
Potassium is one of the important indicators of water-electrolyte and acid-base balance.
- Disorders of renal function;
- Pathology of the cardiovascular system;
- Adrenal insufficiency;
- When prescribing diuretics, cardiac glycosides to control potassium in the blood.
Possible interpretation of the results
Potassium concentration increases:
- Decreased excretion of potassium by the kidneys: acute renal failure, chronic renal failure, oliguria, anuria;
- Diseases associated with cell damage: hemolysis of erythrocytes, disseminated intravascular coagulation syndrome, burns, severe muscle damage, rhabdomyolysis, tissue hypoxia, tumor lysis syndrome;
- Massive parenteral administration of potassium;
- Severe metabolic acidosis and shock;
- Dehydration;
- Chronic adrenal insufficiency (hypoaldosteronism);
- Diabetic coma prior to insulin therapy, decompensated diabetes mellitus;
- Pseudohypoaldosteronism;
- Thrombocytosis in some chronic myeloproliferative syndromes;
- Intake of potassium-sparing diuretics.
Potassium concentration decreases:
- Decreased K + excretion and metabolic acidosis or alkalosis (extrarenal K + loss): diarrhea, vomiting, fistulas, laxatives, profuse sweating, severe burns;
- Decreased K + excretion without metabolic acidosis or alkalosis: parenteral therapy without potassium supplementation, fasting, anorexia, malabsorption, chronic alcoholism, treatment of anemia with iron, vitamin B12 or folic acid;
- Increased K + excretion and metabolic acidosis: renal tubular, diabetic or alcoholic ketoacidosis;
- Increased excretion of K + and normal pH level (usually of renal origin): healing process of obstructive nephropathy, hypomagnesemia, periodic hypokalemic paralysis, monocytic leukemia;
- Congenital hyperplasia of the adrenal gland (associated with metabolic alkalosis);
- Infectious mononucleosis;
- Intense physical activity;
- Glucose injections associated with increased insulin levels;
- Stress;
- Decrease in body temperature.