Also known as: Calcium, Ionized
CPT code: 82330the billing code Quest, Labcorp and hospital labs all use for this test
The short answer
Measures ionized calcium — the free, biologically active form of calcium in your blood, separate from the total calcium reported on a metabolic panel, measured from a standard blood draw. At TestWell it costs $29.99 plus a $6 lab processing fee, needs no fasting, and results post in 1–3 business days. Physician-authorized with no doctor's visit or insurance needed; draw at Quest or Labcorp.
Hospital Lab
$120
cash pay
Other Labs
$52
+ lab fees
TestWell
$29.99
+ $6 lab processing fee
Often ordered together
Ferritin
$21.99
Comprehensive Metabolic Panel
$21.49
TSH
$20.99
About half of the calcium in blood is bound to albumin and other proteins; the rest circulates as free ions, and that ionized fraction is what regulates muscle contraction, nerve signaling, heart rhythm and blood clotting. A total calcium result can be misleading when albumin is low or high, when blood pH is abnormal, or in kidney disease — ionized calcium measures the active fraction directly. It is commonly ordered alongside intact PTH, phosphorus, magnesium and vitamin D when evaluating parathyroid disorders, unexplained high or low calcium, kidney stones, or symptoms such as tingling, cramps and muscle spasms.
Vitamin and nutrient testing identifies deficiencies that can drive fatigue, immune dysfunction, neurological symptoms, and long-term disease risk — and confirms that supplementation is working.
Anyone with restrictive diets (vegan, low-fat, low-carb), malabsorption conditions, fatigue, hair loss, mood changes, or currently supplementing and wanting to verify dosing.
Sample Type
Blood draw
Fasting
Not required
Results In
1–3 business days · typical; varies by lab and draw day
Performed At
Quest or Labcorp
1 biomarker tested
Your Calcium, Ionized results will include values for each of the 1 biomarker tested, along with reference ranges. Results are reviewed by a licensed physician before being released to your secure portal.
If any values fall outside the normal range, your report will include guidance on what that may mean and recommended next steps. You'll receive an email notification when your results are ready, typically within 1–3 business days.
Typical reference range layout
Lab reports show where your value sits relative to established reference intervals—your physician interprets this in context for you. Already have results? Analyze them with your AI assistant against our physician-reviewed ranges.
No fasting required. Ionized calcium is sensitive to handling, so the lab collects it in a dedicated tube and processes it promptly — nothing extra is needed from you.
TestWell orders the same Calcium, Ionized the labs run for doctors' offices, so you can walk into any of these labs with our requisition — no doctor's visit, a licensed physician authorizes the order, and most patient service centers take walk-ins. The table shows each lab's own test code, the name printed on the requisition, what the lab charges on its own consumer site, and the price through TestWell at that lab (plus one $6 fee per order).
| Lab | Test code | On the requisition | Lab's own site | Through TestWell |
|---|---|---|---|---|
| Quest Diagnostics | test code 306 | “Calcium, Ionized” | not sold direct | $29.99 + $6 |
| Labcorp | test no. 004804 | “Calcium, Ionized” | not sold direct | $29.99 + $6 |
You choose the lab at checkout; the requisition is written for that lab and arrives by email within minutes. New York and New Jersey orders draw at BioReference. Lab-direct prices are read from the labs' public pages and re-checked regularly.
Where to get it near you: patient service centers by state and city · search by ZIP code
An Ionized Calcium test costs $29.99 at TestWell — $35.99 all-in, since the $6 lab processing fee is charged once per order and there is no draw or physician fee. Hospital outpatient labs typically bill around $120.00 self-pay. With insurance you pay your plan's negotiated rate against your deductible; TestWell's price is fixed before the draw and HSA/FSA-eligible.
| Where you order | Price | One test, all-in | Notes |
|---|---|---|---|
| TestWell (drawn at Quest or Labcorp) | $29.99 | $35.99 | Includes the one $6 lab processing fee, charged once per order |
| Hospital outpatient lab, self-pay (typical) | $120.00 | $120.00 | Reference figure; hospital charges vary widely by facility and are often higher |
Lab test codes: Quest test code 306 · Labcorp test no. 004804. Competitor prices are read from the linked public pages and re-checked regularly; the labs' sites may add taxes or change prices without notice.
Compare more: Quest Diagnostics price list · Labcorp price list · Quest vs Labcorp · Lab test price checker
Most Calcium, Ionized results are available in 1–3 business days after your specimen arrives at the lab. You'll get an email the moment results are ready, with everything viewable in your TestWell portal.
Blood draw. A standard venous blood draw, collected at any Quest, Labcorp or BioReference patient service center — walk in with the requisition we email you, no appointment needed at most locations.
On TestWell, the Calcium, Ionized is $29.99. Quest Direct lists comparable tests at $52. Walk-in hospital labs typically bill $120 or more without insurance. Insurance is not required — pay one all-in price.
No fasting required for the Calcium, Ionized. No fasting required. Ionized calcium is sensitive to handling, so the lab collects it in a dedicated tube and processes it promptly — nothing extra is needed from you.
The Calcium, Ionized is available at Quest and Labcorp patient service centers nationwide. Order online at TestWell, pick your preferred lab, and we'll generate a digital requisition for the location closest to you.
Yes. Laboratory tests are a qualified medical expense under IRS Publication 502, so the Ionized Calcium test ($29.99 plus the $6 per-order lab fee) can be paid with an HSA or FSA debit card at checkout, or reimbursed from the itemized receipt in your TestWell account. For a health FSA the expense counts on the day your blood is drawn, which matters at the December 31 plan-year deadline.
CPT 82330. That is the billing code Quest, Labcorp and hospital laboratories all use for an Ionized Calcium test, so it is the number to match on an explanation of benefits, a doctor's order or a price list — the same code, the same test, whichever lab draws it. You do not need the code to order: TestWell sells the Ionized Calcium test for $29.99 with the physician order included, no insurance required, and results in 1–3 business days.
The Ionized Calcium test is Quest Diagnostics test code 306, Labcorp test number 004804 (CPT 82330). TestWell orders it under those codes for $29.99 at Quest or Labcorp — no doctor's visit or insurance required, results in 1–3 business days. Codes verified against the labs' catalogs in 2026.
Medically reviewed by Youmna DiStefano, MD · Last reviewed September 2026
TestWell Price
$29.99
+ $6 lab processing fee at checkout
Often ordered together
Ferritin
$21.99
Comprehensive Metabolic Panel
$21.49
TSH
$20.99
No insurance needed · HIPAA compliant
Frequently ordered together
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Calcium, Ionized
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