Potassium
The electrolyte that keeps your heartbeat and muscles working, and a key check on kidney and acid-base balance.
Consider this test if:
- On a diuretic, ACE inhibitor, or other medication that shifts potassium
- Monitoring kidney disease or being treated for acidosis or ketoacidosis
- Muscle weakness, cramps, palpitations, or an irregular heartbeat
- Investigating high blood pressure that could involve aldosterone excess
- Tracking electrolytes after vomiting, diarrhea, or heavy fluid loss
- HSA/FSA eligible
- Typical results in 1 day · Reviewed by a real clinician
- Drawn at a CLIA/CAP-accredited lab near you ·
Pre-test considerations
Fasting for about 12 hours before the draw is preferred. Potassium is highly sensitive to collection technique: avoid fist clenching and prolonged tourniquet use, since both can falsely raise the result. Note any diuretics, ACE inhibitors, NSAIDs, or potassium supplements you take, as these shift the level.
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What this test is for
Potassium is the main electrolyte inside your cells, essential for nerve signaling, muscle contraction, and a steady heart rhythm. This test measures potassium in serum or plasma, the standard way to assess electrolyte balance, kidney function, and acid-base status. Low potassium (hypokalemia) is commonly linked to vomiting, diarrhea, diuretic use, alkalosis, and conditions of mineralocorticoid excess such as primary aldosteronism, and it can cause muscle weakness, cramps, and arrhythmias. High potassium (hyperkalemia) usually reflects reduced kidney excretion, acidosis, or certain medications including potassium-sparing diuretics and NSAIDs. This is the routine serum measure of potassium status; the separate Potassium, RBC test looks at intracellular stores, and the Electrolyte Panel and Basic Metabolic Panel bundle serum potassium with sodium, chloride, and other markers when a broader metabolic picture is needed.
- Specimen
- Serum or plasma
- Measures
- Substance concentration
What you'll learn
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Insights that connect the dots. A clinician reads your whole picture, not one result in isolation, connecting family history, past results, and lifestyle into clear next steps.
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Your personalized action plan. Nutrition, supplements, and training in one clinician-reviewed protocol, updated as your results change.
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Track your trends. Upload results from any lab and see each biomarker trend over time, so you know what is working.
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Never miss a recheck. Mito tells you what is worth retesting and when, then reminds you so nothing slips.
What to expect
- 1 Book instantly
Click, book, done. Choose a convenient lab location near you. Transparent, up-front pricing.
- 2 Quick lab visit
Testing to fit your busy schedule, usually 15 minutes or less. Walk-in and appointments available.
- 3 Typical results in 1 day
Your results post straight to your dashboard as soon as the lab completes them.
- 4 Expert guidance
Included with Mito membership. A clinician reviews your results and your personalized action plan follows, with clear next steps.
Everything your health needs,
in one membership
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Every test at our cost
Members pay our cost on every test, with lab fees passed straight through. The full receipt is itemized, never padded.
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Continuous tracking, all in one place
Upload past labs and watch your trends over time. Every marker and visit lives in one longitudinal record, so all your care stays together.
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Year-round clinician support
Text anytime and get clinician-reviewed answers. When you want to go deeper, 1:1 consultations are available at affordable rates.
All for $9/month
Order any test or consult without joining. For $9/month, members unlock member prices, trend tracking, and year-round clinician guidance.
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Frequently asked questions
View all FAQsHow does pricing work?
Every test shows the member price next to the standard non-member price, so you can see what membership saves you. The member price is our cost, covering the lab and what it takes to run the service. It is never a profit on the test itself. Mito makes its money on the $9 membership, not on marking up your tests. Membership is $9 per month, and any applicable lab order or draw fee is itemized before you pay.
Where do I get tested?
Choose an available partner lab at checkout. If your cart contains multiple blood tests, Mito helps consolidate the eligible tests at one lab when possible. At-home kits and scans follow the collection or appointment process shown on their product page.
Is this eligible for HSA/FSA?
Yes. Eligible tests can be paid for with an HSA or FSA card at checkout.
When will I get my results?
Your results appear in your Mito dashboard after the laboratory completes processing. A clinician then reviews them before your analysis and personalized action plan are finalized. Timing varies by test, and specialty assays and at-home kits may take longer.
Do I need a physician's order?
No. Mito provides the laboratory order when one is required, so you do not need to arrange a separate physician visit before purchasing.
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