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Electrolytes
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Currently under review
Pending specialist review and validation.
This test measures the amount of potassium in whole blood using a blood gas analyzer. Potassium is an essential electrolyte that helps your nerves signal, your muscles contract, and your heart keep a steady rhythm.
The “Other” designation refers to a non‑arterial blood gas specimen, such as venous or capillary whole blood, collected for rapid assessment at the bedside or in the laboratory. Because the measurement is performed on whole blood and processed quickly, results can differ slightly from a standard serum potassium test.
Potassium outside the expected range can affect heart rhythm, muscle strength, and nerve function. Clinicians order this test when quick decisions are needed in urgent care settings, during procedures, or when symptoms suggest a potassium problem.
It is also used if you take medicines that influence potassium, if you have kidney issues, or if your acid base balance is changing. Tracking potassium helps guide treatments, prevent complications, and fine tune therapies that can shift potassium into or out of the bloodstream.
Your result is interpreted together with your symptoms, medications, and other tests, including kidney function and acid base status. Whole blood values may not exactly match a serum potassium drawn at the same time, so your care team may focus on the clinical picture and on changes over time.
If your value falls outside the expected range for your age group, your clinician will consider causes such as medication effects, dehydration, blood draw issues, or underlying illness. Follow up can include repeating the test, checking an electrocardiogram, reviewing medicines, adjusting fluids or diet, or giving treatments that shift or remove potassium.
Do not change supplements or salt substitutes on your own. If you feel worsening weakness, chest discomfort, marked palpitations, or severe cramps, seek care promptly.
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.
Red blood cells contain high potassium. If the sample is hemolyzed, stored improperly, or analyzed late, potassium can appear falsely high. Prompt analysis on a well collected whole blood specimen reduces this risk.
Prolonged tourniquet use, fist clenching, or using a small needle can distort results. Gentle collection, proper mixing, and avoiding excessive pressure during sampling help produce reliable values.
Diuretics, ACE inhibitors, ARBs, aldosterone antagonists, trimethoprim, and potassium supplements can raise potassium. Insulin, beta agonists, and some diuretics can lower it by shifting potassium into cells.
Changes in acid base balance and insulin levels shift potassium between cells and blood. Acidemia tends to raise measured potassium, while alkalemia and insulin can lower it.
The kidneys regulate potassium excretion. Reduced kidney function or severe dehydration can raise potassium, while excessive losses from the gut or urine can lower it.
Newborns and infants have different expected intervals, and capillary samples are more prone to collection artifacts. Your clinician will interpret results using age appropriate ranges and specimen details.
References