Magnesium
A mineral essential to muscle, nerve, and heart rhythm, and an easy deficiency to miss.
Consider this test if:
- Muscle cramps, tremors, weakness, or palpitations with no clear cause
- Low potassium or low calcium that does not correct with supplementation
- Taking loop or high-dose thiazide diuretics, or medications that deplete magnesium
- Heavy alcohol use, diabetes, or a malabsorption condition
- Tracking magnesium status while supplementing or after a documented deficiency
- 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
No fasting required. If you take magnesium supplements or magnesium-containing antacids or laxatives, note the dose and timing, since recent intake can raise the result. Magnesium-containing products can mask a true deficiency, so consistent timing matters when comparing results over time.
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What this test is for
Magnesium is a mineral involved in hundreds of enzymatic reactions, including muscle contraction, nerve signaling, blood pressure regulation, and heart rhythm. Low magnesium is linked to muscle weakness, tremors, cramps, and in severe cases tetany, seizures, and cardiac arrhythmias, and it often travels with low calcium and stubborn low potassium that does not respond to supplementation. Common drivers of deficiency include alcohol use, poorly controlled diabetes, malabsorption, diuretics, and certain medications; high levels are seen mainly in kidney failure or with heavy use of magnesium-containing antacids and laxatives.
This test measures magnesium in serum, the standard status check and the right default for investigating symptoms or routine monitoring. The separate RBC magnesium test reflects what is stored inside cells and is used when serum looks normal but intracellular depletion is still suspected.
- Specimen
- Serum or plasma
- Measures
- Mass 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.
Mito Membership
$9 /mo
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Without membership
$0
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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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