Potassium · high result
What does a high Potassium mean?
Short answer
High potassium (hyperkalemia) is frequently a sample artifact — a tight tourniquet, fist clenching, hemolysis, or delayed processing — so an unexpected result is repeated before anything else. True causes include kidney disease, medications (ACE inhibitors, ARBs, spironolactone, potassium supplements, NSAIDs, trimethoprim), adrenal insufficiency and uncontrolled diabetes. Severe elevations affect heart rhythm.
Medically reviewed by Youmna DiStefano, MD · Last reviewed September 2026
When does this result need same-day care?
- Potassium above 6.0 mmol/L, or any elevation with palpitations, weakness or an irregular pulse — same-day care
What is the normal range for Potassium?
- age 18+: 3.50 – 5.00 mmol/L
Can reflect kidney issues, certain medications, or sample handling issues. Severe elevations can affect heart rhythm.
Full reference table, citations and testing options: Potassium biomarker page.
What are the common causes of high Potassium?
- Sample artifact: hemolysis, fist clenching, prolonged tourniquet, delayed processing
- Reduced kidney function
- Medications: ACE inhibitors, ARBs, spironolactone, eplerenone, NSAIDs, trimethoprim, potassium supplements and salt substitutes
- Adrenal insufficiency
- Uncontrolled diabetes, tissue breakdown, acidosis
What symptoms go with high Potassium?
- Usually none until high
- Muscle weakness, palpitations, nausea
What do clinicians usually check next?
- Repeat with careful collection and prompt processing
- Creatinine and eGFR, glucose, medication review
- ECG if above about 6 mmol/L or symptomatic
Follow-up tests available at TestWell: Glucose ($14.99).
How do you recheck Potassium?
Prices are cash-pay; every order adds one $6 lab processing fee. Physician authorization is included; no insurance or referral needed.
| Test or panel | Type | Price | Fasting | Results |
|---|---|---|---|---|
| Basic Metabolic Panel | Test · 8 biomarkers | $20.99 | Yes | 1–3 business days |
Common questions
Why would my potassium be high if I feel fine?
Most often the sample: clenching, a tourniquet on too long, or red cells breaking during processing release potassium. A calm repeat draw usually normalizes it.
Sources
Educational content, not a diagnosis. Lab results are one input; a clinician interprets them with your history and exam.