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Electrolytes
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This test measures the amount of potassium in the liquid part of your blood, usually serum or plasma. Potassium is an essential mineral and electrolyte that helps your nerves signal, your muscles contract, and your heart keep a steady rhythm. It also plays a key role in fluid balance and acid-base regulation in your body.
Potassium is checked on its own or as part of a basic or comprehensive metabolic panel. Because levels can be affected by health conditions, medicines, and even how the blood sample is collected, unexpected results are often confirmed with a repeat test.
Potassium that is too low or too high can affect how your muscles and heart work. Doctors order this test when you have symptoms such as weakness, cramps, tingling, or palpitations; during hospital care or urgent illness; before procedures; and to monitor known conditions that can disturb potassium balance.
The test is especially important if you have kidney or heart disease, diabetes, high blood pressure, or adrenal disorders, or if you take medicines that influence potassium. These include diuretics, ACE inhibitors, ARBs, mineralocorticoid receptor antagonists, NSAIDs, and potassium supplements. Results guide treatment decisions such as adjusting diet, changing medications, or using potassium binders.
Your clinician will interpret your potassium level along with your symptoms, other lab results, kidney function, and sometimes an electrocardiogram. If a result is unexpected, the lab may repeat the test or recollect a sample to rule out collection issues such as red blood cell breakage, prolonged tourniquet time, or delays in processing.
If your level is higher than expected, your team will consider causes such as reduced kidney function, certain medicines, high intake of potassium or salt substitutes, and shifts from tissue breakdown or acidosis. If lower than expected, causes may include losses from vomiting, diarrhea, sweating, or diuretics, and internal shifts related to insulin or alkalosis. Treatment depends on the cause and how you feel. Do not change medicines or diet without medical advice.
Seek urgent care for severe muscle weakness, paralysis, new palpitations, chest pain, or fainting. Otherwise, plan next steps with your clinician, which may include repeat testing, medication review, and individualized nutrition guidance.
Reference intervals vary by laboratory, analyzer, methodology, population, and units. The ranges shown here are for education only. Always interpret your results against the reference interval printed on your own lab report.
Breaking of red blood cells during the draw, prolonged tourniquet use, fist clenching, or delays in processing can falsely raise potassium. A clean recollection often resolves spurious results.
Your kidneys regulate potassium balance. Chronic kidney disease or acute kidney injury can lead to elevated potassium, while improved kidney function or excess losses can lower it.
Diuretics, ACE inhibitors, ARBs, mineralocorticoid antagonists, NSAIDs, heparin, and potassium supplements can raise or lower potassium. Insulin and beta-agonists can shift potassium into cells and lower blood levels.
High intake of potassium-rich foods or salt substitutes can raise levels, especially if kidney function is reduced. Very low intake may contribute to low levels in some situations.
Metabolic acidosis, severe hyperglycemia, or tissue breakdown can move potassium out of cells and increase blood levels. Alkalosis or rapid insulin administration can lower measured levels.
Normal potassium ranges vary with age, and infants may have different expected values. Pregnancy, serious illness, and strenuous exercise can also influence results and interpretation.
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