Calcium, Total (Red Blood Cells)
A specialized look at calcium held inside red blood cells, not the calcium floating in your blood.
Consider this test if:
- A clinician has specifically requested intracellular calcium rather than a standard blood level
- Investigating cellular calcium handling that serum calcium does not capture
- Following up on a specialized workup where red-cell mineral content is being tracked
- You want this specific analyte rather than the routine serum calcium test
- HSA/FSA eligible
- Results delivered to your dashboard · Reviewed by a real clinician
- Drawn at a CLIA/CAP-accredited lab near you ·
Pre-test considerations
No specific fasting instructions are established for this test. The specimen has strict handling requirements: red blood cells collected in a sodium heparin (green-top) tube, transported refrigerated in an acid-washed tube, since the sample is unstable at room temperature. If you are choosing between calcium tests, confirm with your clinician that the red-blood-cell version is the one intended, as serum or ionized calcium answers most clinical questions.
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What this test is for
This test measures total calcium inside red blood cells, reported relative to hemoglobin (mg/g). It reflects intracellular calcium content rather than the calcium circulating in your bloodstream, and it is a specialized rather than routine measurement.
For everyday questions about calcium status, bone health, parathyroid function, or symptoms like muscle cramps and fatigue, serum calcium is the standard test, and ionized calcium is the right choice when you need the physiologically active fraction unaffected by albumin. The 24-hour urine calcium tests are used to assess how much calcium the kidneys excrete, relevant for kidney stones. This red-blood-cell version answers a narrower research-oriented question about calcium held within cells.
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 Fast, dashboard-delivered results
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
pay as you go
At-cost pricing on labs, scans, and more
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On-demand clinician consults when you need guidance
Personalized action plans across supplements, exercise, nutrition, and sleep
AI health coaching to help you act on your results
Year-round medical support, with in-chat clinician escalation
All your health records in one personal vault, with trends and biological age tracking
Early access to new diagnostics and product releases
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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 — never a profit on the test itself; Mito makes its money on the $9 membership, not on marking up your tests. Membership is $9/mo, and you still pay the lab’s order fee. Prices are itemized before you pay, with no hidden fees.
Where do I get tested?
Choose a partner lab (Quest, Labcorp, or BioReference) at checkout. If your cart spans multiple tests, we consolidate the whole order onto a single lab so you only make one visit.
Is this eligible for HSA/FSA?
Yes. This test is HSA/FSA eligible, and you can pay with your HSA/FSA card at checkout.
When will I get my results?
Your results post to your dashboard once your lab completes them, then a clinician reviews them and your full analysis and personalized action plan (with clear next steps) follow. Turnaround varies by test: specialty assays and at-home kits take longer, and each test shows its expected turnaround before you buy.
Do I need a doctor’s order?
No. Mito provides the lab order for you, so you can book and get tested without a separate doctor visit.
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