The short answer
Essential mineral for muscles, nerves, and sleep — up to 50% of Americans don't get enough, measured from a standard blood draw. At TestWell it costs $19.99 plus a $6 lab fee, needs no fasting, and results post in 2–4 business days. Physician-authorized with no doctor's visit or insurance needed; draw at Quest or Labcorp.
Hospital Lab
$80
cash pay
Other Labs
$25
+ lab fees
TestWell
$19.99
+ $6 lab fee
Magnesium is involved in over 300 enzymatic reactions in the body, including muscle and nerve function, blood sugar regulation, and blood pressure control. Despite its importance, an estimated 50% of Americans don't meet the recommended daily intake. Deficiency can cause muscle cramps, insomnia, anxiety, headaches, and irregular heartbeat.
Measures serum magnesium — a cofactor in 300+ enzymatic reactions including energy production, muscle contraction, sleep regulation, and blood-sugar control.
Anyone with muscle cramps, restless legs, insomnia, palpitations, migraine, or on medications that deplete magnesium (PPIs, diuretics, metformin). Increasingly ordered alongside Vitamin D for general wellness.
Sample Type
Blood draw
Fasting
Not required
Results In
2–4 business days
Performed At
Quest or Labcorp
Your Magnesium 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 2–4 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.
No fasting required.
A Magnesium test costs $19.99 at TestWell — $25.99 all-in when ordered alone, because the $6 lab processing fee is charged once per order, with no draw fee or physician fee added. Ordered directly from the labs' own consumer sites, the same test lists at $39.00 at Quest Health and $39.00 at Labcorp OnDemand (list prices checked Sep 12, 2026). Hospital outpatient labs typically bill around $80.00 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. Full cost breakdown →
| Where you order | Price | One test, all-in | Notes |
|---|---|---|---|
| TestWell (drawn at Quest or Labcorp) | $19.99 | $25.99 | Includes the one $6 lab processing fee, charged once per order |
| Quest Health (Quest Diagnostics' own site) | $39.00 | $39.00 | list price checked Sep 12, 2026 |
| Labcorp OnDemand (Labcorp's own site) | $39.00 | $39.00 | list price checked Sep 12, 2026 |
| Hospital outpatient lab, self-pay (typical) | $80.00 | $80.00 | Reference figure; hospital charges vary widely by facility and are often higher |
33% less than the lower lab-direct list price, for the same draw at the same lab. Lab test codes: Quest test code 622 · Labcorp test no. 001537 · BioReference code 0120-6. 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
Medically reviewed by Youmna DiStefano, MD · Last reviewed September 2026
TestWell Price
$19.99
+ $6 lab processing fee at checkout
No insurance needed · HIPAA compliant
Better value: the Vitamin & Mineral Deficiency Panel
Save $106.92This test is part of the Vitamin & Mineral Deficiency Panel — 9 tests · 9 biomarkers for $189.99, $106.92 less than à la carte.
$189.99$296.91
9 tests · 9 biomarkers
Frequently ordered together
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Magnesium
$19.99