Potassium
Disclaimer: Information on this page is for educational purposes. Consult a physician to interpret your test results. Lissa Health helps track biomarker trends but does not replace medical advice.
What This Test Measures
Potassium is the main intracellular cation, critical for cardiac and neuromuscular function. Small serum changes can cause dangerous arrhythmias.
Hyperkalemia often linked to renal failure, ACE inhibitors, potassium-sparing diuretics.
Hypokalemia from diuretics, vomiting, diarrhea, hyperaldosteronism.
Normal Ranges
| Group | Reference Range |
|---|---|
| Men | 3.5–5.1 mmol/L |
| Women | 3.5–5.1 mmol/L |
| Children | 3.4–4.7 mmol/L |
Reference ranges may vary by laboratory and assay method.
Causes of High Levels
- Renal failure
- ACE inhibitors/ARBs
- Potassium supplements
- Hemolysis
- Acidosis
Causes of Low Levels
- Diuretics
- Vomiting/diarrhea
- Hyperaldosteronism
- Insulin therapy
- Magnesium depletion
Test Preparation
- Do not clench fist during venipuncture (falsely ↑ K)
- Report diuretics and ACE inhibitors
Related Biomarkers
| Biomarker | Relationship |
|---|---|
| Sodium | Electrolyte balance |
| Creatinine | Renal excretion |
| Magnesium | Co-depletion |
FAQ
How often should I take this test?
On diuretics/ACEi — every 3–6 months; with CKD — more often.
What should I do if my result is abnormal?
K >6.0 or ❤️.0 mmol/L with symptoms — emergency care (arrhythmia risk).
Last updated: June 2026