Magnesium test cost in Grand Rapids, MI
In Grand Rapids-Wyoming-Kentwood, MI, 11 hospitals list a cash price for magnesium blood test: from $3.90 to $54.40, with a median of $20.00. The lowest listed price is at Mercy Health Saint Marys — $16.10 less than the median here. Across Michigan, the median is $20.00 at 95 hospitals.
- The median here, $20.00, is 52% below the US median of $41.60.
- That is 3.0× Medicare's 2026 national rate for the same service ($6.70).
- Grand Rapids, MI ranks 2nd of 2 metro areas in Michigan by median, cheapest first.
- 7 of 11 hospitals list a cash price equal to their full list price, with no self-pay discount.
Cash prices at 11 facilities across 9 cities for code 83735, as an outpatient — the setting a self-pay patient normally buys. Collected Nov 5, 2026; the hospital files themselves were last updated between Nov 21, 2025 and May 1, 2026.
Where each hospital's price falls
Each dot is one hospital's cash price on a scale from the lowest to the highest in Grand Rapids-Wyoming-Kentwood, MI.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list |
|---|---|---|---|---|
| Mercy Health Saint Marys lowest Grand Rapids, MI · (616) 685-5000 HC Warde 3717400 Magnesium 24 Hour Urine File of Mar 31, 2026 · source file | $3.90 | $6.00 | $2.65–$41.40 | 35% |
| Mercy Health Saint Marys Grand Rapids, MI · (616) 685-5000 HC Warde Magnesium RBC File of Mar 31, 2026 · source file | $5.17 | $7.95 | $3.51–$41.40 | 35% |
| Mercy Health Saint Marys Grand Rapids, MI · (616) 685-5000 HC Magnesium RBC File of Mar 31, 2026 · source file | $9.75 | $15.00 | $3.66–$41.40 | 35% |
| University of Michigan Health-Sparrow Ionia Ionia, MI · (616) 527-4200 HB Magnesium Labor and Delivery+2 more lines at this price File of Apr 1, 2026 · source file | $10.25 | $41.00 | $3.60–$381.87 | 75% |
| University of Michigan Health-Sparrow Carson Carson City, MI · (989) 584-3131 HB Magnesium, 24 Hr Urine+2 more lines at this price File of Apr 1, 2026 · source file | $10.25 | $41.00 | $5.03–$33.21 | 75% |
| Trinity Health Grand Haven Hospital Grand Haven, MI · (616) 847-5268 MAGNESIUM URINE File of Nov 21, 2025 · source file | $10.92 | $10.92 | $3.59–$76.00 | — |
| University of Michigan Health-Sparrow Carson Carson City, MI · (989) 584-3131 HB Assay of Magnesium File of Apr 1, 2026 · source file | $13.00 | $52.00 | $5.03–$42.12 | 75% |
| Corewell Health Zeeland Community Hospital Zeeland, MI · (616) 772-4644 Hc Assay Of Magnesium File of Apr 1, 2026 · source file | $20.00 | $20.00 | — | — |
| Corewell Health Blodgett Hospital Grand Rapids, MI · (616) 391-1774 HC ASSAY OF MAGNESIUM File of May 1, 2026 · source file | $20.00 | $20.00 | — | — |
| Corewell Health Greenville Hospital Greenville, MI · (616) 754-4691 Hc Assay Of Magnesium File of Apr 1, 2026 · source file | $20.00 | $20.00 | — | — |
| Corewell Health Butterworth Hospital Grand Rapids, MI · (616) 391-1774 HC ASSAY OF MAGNESIUM File of May 1, 2026 · source file | $20.00 | $20.00 | — | — |
| Corewell Health Greenville Hospital Greenville, MI · (616) 754-4691 HC ASSAY OF MAGNESIUM File of May 1, 2026 · source file | $27.00 | $27.00 | — | — |
| Corewell Health Zeeland Community Hospital Zeeland, MI · (616) 772-4644 HC ASSAY OF MAGNESIUM File of May 1, 2026 · source file | $27.00 | $27.00 | — | — |
| Corewell Health Pennock Hospital Hastings, MI · (269) 945-3451 HC ASSAY OF MAGNESIUM File of May 1, 2026 · source file | $27.00 | $27.00 | — | — |
| Corewell Health Blodgett Hospital East Grand Rapids, MI Hc Assay Of Magnesium File of Apr 1, 2026 · source file | $27.00 | $27.00 | — | — |
| Corewell Health Butterworth Hospital Grand Rapids, MI · (616) 391-1774 Hc Assay Of Magnesium+1 more line at this price File of Apr 1, 2026 · source file | $27.00 | $27.00 | — | — |
| Trinity Health Grand Haven Hospital Grand Haven, MI · (616) 847-5268 MAGNESIUM FECES File of Nov 21, 2025 · source file | $35.06 | $35.06 | $3.59–$76.00 | — |
| Mercy Health Saint Marys Grand Rapids, MI · (616) 685-5000 HC Magnesium+2 more lines at this price File of Mar 31, 2026 · source file | $35.10 | $54.00 | $3.66–$54.00 | 35% |
| Trinity Health Grand Haven Hospital Grand Haven, MI · (616) 847-5268 MAGNESIUM-RBC File of Nov 21, 2025 · source file | $43.07 | $43.07 | $3.59–$76.00 | — |
| Sheridan Community Hospital Sheridan, MI · (989) 291-3261 MAGNESIUM, 24-HOUR URINE W/O CREAT+3 more lines at this price File of Apr 22, 2026 · source file | $54.40 | $68.00 | $4.85–$60.04 | 20% |
| Trinity Health Grand Haven Hospital Grand Haven, MI · (616) 847-5268 MAGNESIUM URINE+1 more line at this price File of Nov 21, 2025 · source file | $76.00 | $76.00 | $3.59–$76.00 | — |
| Sheridan Community Hospital Sheridan, MI · (989) 291-3261 MAGNESIUM RBC File of Apr 22, 2026 · source file | $92.00 | $115.00 | $4.85–$101.54 | 20% |
Outpatient: lowest $3.90, median $20.00, highest $54.40 — a 13.9× difference within the same market.
As an inpatient, the same code is billed by 9 facilities here, median $20.00. Inpatient and outpatient prices are not comparable and are kept on separate pages: the inpatient charge covers admission, not the same purchase.
Cash or insurance?
At 5 of 5 hospitals that publish insurer rates for this code here, the cash price is below the highest rate a health plan has negotiated, and at 1 it is below every plan's rate. If you have insurance but have not met your deductible, you usually pay your plan's negotiated rate, which falls somewhere in the "Insurers pay" column. Paying cash can cost less, but a cash payment usually does not count toward your deductible. Ask the hospital for both numbers before you book.
What magnesium test is, what the price covers and why prices differ: Magnesium test explained.