Lab tests
Magnesium test cost in St. Louis, MO
Magnesium test is a lab test. Many labs sell tests directly to the public for a flat cash price, often far below hospital prices.
Typical cash price
In Missouri
From 119 hospital and 3 clinic prices in Missouri.
Nationwide typical: $34.43 (most listed prices $6.40–$130).
Cheapest in St. Louis, MO
- $7.92
Doctor fees are billed separately.
Source: Ranken Jordan Pediatric Bridge Hospital price file · checked Oct 2026 - $15.40
Doctor fees are billed separately.
Source: SSM Health Cardinal Glennon Children's Hospital price file · checked Oct 2026 - $16.08
Doctor fees are billed separately.
Source: Missouri Baptist Medical Center price file · checked Oct 2026 - $16.80
Doctor fees are billed separately.
Source: OSF Saint Anthony's Health Center price file · checked Oct 2026 - $18.48
Doctor fees are billed separately.
Source: SSM Health DePaul Hospital - St. Louis price file · checked Oct 2026 - $18.48
Doctor fees are billed separately.
Source: SSM Health St. Clare Hospital - Fenton price file · checked Oct 2026 - $18.48
Doctor fees are billed separately.
Source: SSM Health St. Joseph Hospital - St. Charles price file · checked Oct 2026 - $18.48
Doctor fees are billed separately.
Source: SSM Health St. Mary's Hospital - St. Louis price file · checked Oct 2026 - $18.75
Doctor fees are billed separately.
Source: The Rehabilitation Institute of Southern Illinois price file · checked Oct 2026 - $20.70
Doctor fees are billed separately.
Source: Anderson Rehabilitation Institute price file · checked Oct 2026 - $23.22
Doctor fees are billed separately.
Source: Mercy Rehabilitation Hospital South price file · checked Oct 2026 - St Peters IRF Location The Rehabilitation Institute of St. Louis, an affiliation of BJC HealthCare and Encompass HealthMagnesium testFacility fee only$23.25
Doctor fees are billed separately. +2 more in this system at the same published price.
Source: St Peters IRF Location The Rehabilitation Institut price fil · checked Oct 2026
Common questions
Do I need a doctor's order?
In most states, direct-to-consumer labs can sell many tests without a separate doctor visit. Some states and some tests still require an order.
Is the blood draw included?
Usually yes for lab stores and booking sites. Hospitals sometimes bill the draw (venipuncture) separately.
Why are prices so different?
Each hospital and clinic sets its own cash price. Hospitals publish prices because federal rules require it; clinics and booking sites set prices to compete. The same service can cost several times more at one place than at another nearby.
Can I pay cash if I have insurance?
Yes. You can choose to self-pay. A cash price is often lower than what you would pay before meeting your deductible. Cash payments may not count toward your deductible, so check with your plan. Our cash vs. insurance tool can help you decide.
What is a Good Faith Estimate?
If you are uninsured or paying cash, providers must give you a Good Faith Estimate of the cost on request. If your final bill is $400 or more above the estimate, you can dispute it.