Potassium
Potassium is the main intracellular cation and is essential for heart rhythm, muscle contraction, and nerve conduction. Low potassium (hypokalemia) causes weakness, cramping, and arrhythmias and is often from diuretics, vomiting, or diarrhea;high potassium (hyperkalemia) can cause dangerous arrhythmias and usually reflects kidney dysfunction or potassium-sparing drugs.
20 of 22 providers
Electrolytes &Minerals
3.5-5.0 mEq/L
What is Potassium?
Potassium is the main intracellular cation and is essential for heart rhythm, muscle contraction, and nerve conduction. Low potassium (hypokalemia) causes weakness, cramping, and arrhythmias and is often from diuretics, vomiting, or diarrhea;high potassium (hyperkalemia) can cause dangerous arrhythmias and usually reflects kidney dysfunction or potassium-sparing drugs.
Why It Matters
Essential for heart rhythm and muscle contraction. Abnormal levels can cause fatal arrhythmias. Affected by kidney function and medications.
Which Providers Test Potassium?
Full Provider Comparison
| Provider | Includes | Annual Cost | Biomarkers |
|---|---|---|---|
 Superpower | ✓ | $199 | 100+ (150 with ratios) |
 WHOOP Advanced Labs | ✓ | $349 | 65 |
 Labcorp OnDemand | ✓ | $398 | 40+ |
| ✓ | $486 | 40+ | |
| ✓ | $449 | 288 | |
| ✓ | $349 | 100+ | |
| ✓ | $829 | 54 | |
 Function Health | ✓ | $365 | 160+ |
| ✓ | $250 | 65 | |
| ✓ | $495 | 80+ | |
| ✓ | $895 | 100+ | |
| ✓ | $1950 | 130+ | |
| ✓ | $375 | 95+ | |
| — | $Varies | 75+ | |
| ✓ | $190 | 100+ | |
| ✓ | $99 | 50 | |
| — | $124 | 60 | |
| ✓ | $349 | 130+ | |
| ✓ | $349 | 80+ | |
| ✓ | $375 | 85 | |
| ✓ | $700 | 128 | |
| ✓ | $99 | 100+ |
Frequently Asked Questions
What is Potassium?
Potassium is the main intracellular cation and is essential for heart rhythm, muscle contraction, and nerve conduction. Low potassium (hypokalemia) causes weakness, cramping, and arrhythmias and is often from diuretics, vomiting, or diarrhea;high potassium (hyperkalemia) can cause dangerous arrhythmias and usually reflects kidney dysfunction or potassium-sparing drugs.
What is the optimal range for Potassium?
The standard reference range for Potassium is 3.5-5.0 mEq/L. Optimal ranges may differ based on individual health goals and expert recommendations.
Which blood test providers include Potassium?
20 out of 22 blood testing providers include Potassium in their panels. This biomarker is widely available across major providers.
What category does Potassium fall under?
Potassium is categorized under Electrolytes &Minerals. This category includes biomarkers that help assess related aspects of health and wellness.
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Medical Disclaimer
This information is for educational purposes only and is not medical advice. Always consult with a qualified healthcare provider about your specific health needs.
Last reviewed:2026-04-12