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 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 fee
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.
Sample Type
Blood draw
Fasting
Not required
Results In
1–3 business days
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.
An Ionized Calcium test costs $29.99 at TestWell — $35.99 all-in when ordered alone, because the $6 lab processing fee is charged once per order, with no draw fee or physician fee added. Hospital outpatient labs typically bill around $120.00 self-pay for the same test, and often more. With insurance, what you pay depends on your deductible and your plan's negotiated rate; TestWell's price is fixed before the draw and is 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
Ionized Calcium test results are typically ready in 1–3 business days after your draw at Quest or Labcorp. TestWell emails you the moment they post, and your results dashboard shows each marker against its reference range with a plain-English explanation.
No, fasting is not required for an Ionized Calcium test — you can eat normally and book any time of day. 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.
Order the Ionized Calcium test online from TestWell for $29.99 (plus a $6 per-order lab processing fee) — no doctor's visit, referral or insurance needed. A licensed physician authorizes the order, you walk into any Quest or Labcorp patient service center for the draw, and results arrive in 1–3 business days.
The CPT code for an Ionized Calcium test is 82330. You can order it from TestWell for $29.99 — no doctor's visit or insurance required, with 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.
TestWell Price
$29.99
+ $6 lab processing fee at checkout
No insurance needed · HIPAA compliant
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Calcium, Ionized
$29.99