Magnesium test cost in Milwaukee, WI
In Milwaukee-Waukesha, WI, 17 hospitals list a cash price for magnesium blood test: from $13.34 to $57.77, with a median of $50.00. The lowest listed price is at Children's Hospital of Wisconsin — $36.66 less than the median here. Across Wisconsin, the median is $50.00 at 80 hospitals.
Cash prices at 17 facilities across 11 cities for code 83735, as an outpatient — the setting a self-pay patient normally buys. Collected Sep 23, 2026; the hospital files themselves were last updated between Nov 21, 2025 and Mar 23, 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 Milwaukee-Waukesha, WI.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list | File date |
|---|---|---|---|---|---|
| Children's Hospital of Wisconsin lowest Milwaukee, WI · (414) 266-3954 HBC MAGNESIUM KIDSTN | $13.34 | $24.25 | $16.98–$23.04 | 45% | Mar 23, 2026 source file |
| Children's Hospital of Wisconsin lowest Milwaukee, WI · (414) 266-3954 HBC MAGNESIUM KIDSTN | $13.34 | $24.25 | $16.98–$23.04 | 45% | Mar 23, 2026 source file |
| Columbia St. Mary's Glendale, WI MAGNESIUM | $37.63 | $71.00 | $6.50–$16.35 | 47% | — source file |
| Ascension SE Wisconsin Hospital Milwaukee, WI · (414) 447-2130 HC ASSAY OF MAGNESIUM | $39.75 | $75.00 | $7.04–$31.46 | 47% | — source file |
| Ascension St. Francis Hospital Milwaukee, WI · (414) 647-5000 HC ASSAY OF MAGNESIUM | $39.75 | $75.00 | $7.04–$31.46 | 47% | — source file |
| Wheaton Franciscan Healthcare - Southeast Wisconsin Franklin, WI HC ASSAY OF MAGNESIUM | $39.75 | $75.00 | $7.04–$31.46 | 47% | — source file |
| Ascension SE Wisconsin Hospital Franklin, WI HC ASSAY OF MAGNESIUM | $39.75 | $75.00 | $7.04–$31.46 | 47% | — source file |
| Aurora Medical Center Summit Summit, WI · (262) 434-1600 MAGNESIUM SRDP | $50.00 | $100.00 | $5.36–$85.00 | 50% | Nov 21, 2025 source file |
| Aurora Medical Center Washington County Hartford, WI · (262) 673-2300 MAGNESIUM SRDP | $50.00 | $100.00 | $5.36–$85.00 | 50% | Nov 21, 2025 source file |
| Aurora Medical Center Washington County Hartford, WI · (262) 673-2300 MAGNESIUM URINE | $50.00 | $100.00 | $5.36–$85.00 | 50% | Nov 21, 2025 source file |
| Aurora Medical Center Grafton Grafton, WI · (262) 329-1000 MAGNESIUM SRDP | $50.00 | $100.00 | $5.36–$85.00 | 50% | Nov 21, 2025 source file |
| Aurora Medical Center Kenosha Kenosha, WI · (262) 948-5600 MAGNESIUM URINE | $50.00 | $100.00 | $5.36–$85.00 | 50% | Nov 21, 2025 source file |
| Aurora St Lukes Medical Center of Aurora Health Care Metro Milwaukee, WI · (414) 649-6000 MAGNESIUM URINE | $50.00 | $100.00 | $5.36–$85.00 | 50% | Nov 21, 2025 source file |
| Aurora St Lukes Medical Center of Aurora Health Care Metro Milwaukee, WI · (414) 649-6000 MAGNESIUM SRDP | $50.00 | $100.00 | $5.36–$85.00 | 50% | Nov 21, 2025 source file |
| Aurora St Lukes South Shore of Aurora Health Care Metro Cudahy, WI MAGNESIUM URINE | $50.00 | $100.00 | $5.36–$85.00 | 50% | Nov 21, 2025 source file |
| Aurora West Allis Medical Center West Allis, WI · (414) 328-6000 MAGNESIUM SRDP | $50.00 | $100.00 | $5.36–$85.00 | 50% | Nov 21, 2025 source file |
| Aurora St Lukes South Shore of Aurora Health Care Metro Cudahy, WI MAGNESIUM SRDP | $50.00 | $100.00 | $5.36–$85.00 | 50% | Nov 21, 2025 source file |
| Aurora Medical Center Summit Summit, WI · (262) 434-1600 MAGNESIUM URINE | $50.00 | $100.00 | $5.36–$85.00 | 50% | Nov 21, 2025 source file |
| Aurora West Allis Medical Center West Allis, WI · (414) 328-6000 MAGNESIUM URINE | $50.00 | $100.00 | $5.36–$85.00 | 50% | Nov 21, 2025 source file |
| Aurora Psychiatric Hospital Wauwatosa, WI · (414) 454-6600 MAGNESIUM URINE | $50.00 | $100.00 | $5.36–$85.00 | 50% | Nov 21, 2025 source file |
| Aurora Medical Center Grafton Grafton, WI · (262) 329-1000 MAGNESIUM URINE | $50.00 | $100.00 | $5.36–$85.00 | 50% | Nov 21, 2025 source file |
| Aurora Sinai Medical Center of Aurora Health Care Metro Milwaukee, WI MAGNESIUM SRDP | $50.00 | $100.00 | $5.36–$85.00 | 50% | Nov 21, 2025 source file |
| Aurora Sinai Medical Center of Aurora Health Care Metro Milwaukee, WI MAGNESIUM URINE | $50.00 | $100.00 | $5.36–$85.00 | 50% | Nov 21, 2025 source file |
| Columbia St. Mary's Hospital Milwaukee Milwaukee, WI · (414) 585-1374 HC ASSAY OF MAGNESIUM | $57.77 | $109.00 | $7.04–$30.55 | 47% | — source file |
| Columbia St. Mary's Hospital Ozaukee Mequon, WI HC ASSAY OF MAGNESIUM | $57.77 | $109.00 | $7.04–$30.55 | 47% | — source file |
| Columbia St. Mary's Hospital Ozaukee Mequon, WI HC ASSAY OF MAGNESIUM | $57.77 | $109.00 | $7.04–$30.55 | 47% | — source file |
| Columbia St. Mary's Hospital Milwaukee Milwaukee, WI · (414) 585-1374 HC ASSAY OF MAGNESIUM | $57.77 | $109.00 | $7.04–$30.55 | 47% | — source file |
| Aurora St Lukes Medical Center of Aurora Health Care Metro Milwaukee, WI · (414) 649-6000 MAGNESIUM SERUM | $65.00 | $130.00 | $5.36–$110.50 | 50% | Nov 21, 2025 source file |
| Aurora Medical Center Grafton Grafton, WI · (262) 329-1000 MAGNESIUM SERUM | $65.00 | $130.00 | $5.36–$110.50 | 50% | Nov 21, 2025 source file |
| Aurora Medical Center Summit Summit, WI · (262) 434-1600 MAGNESIUM SERUM | $65.00 | $130.00 | $5.36–$110.50 | 50% | Nov 21, 2025 source file |
| Aurora Medical Center Washington County Hartford, WI · (262) 673-2300 MAGNESIUM SERUM | $65.00 | $130.00 | $5.36–$110.50 | 50% | Nov 21, 2025 source file |
| Aurora Medical Center Kenosha Kenosha, WI · (262) 948-5600 MAGNESIUM SERUM | $65.00 | $130.00 | $5.36–$110.50 | 50% | Nov 21, 2025 source file |
| Aurora Psychiatric Hospital Wauwatosa, WI · (414) 454-6600 MAGNESIUM SERUM | $65.00 | $130.00 | $5.36–$110.50 | 50% | Nov 21, 2025 source file |
| Aurora Sinai Medical Center of Aurora Health Care Metro Milwaukee, WI MAGNESIUM SERUM | $65.00 | $130.00 | $5.36–$110.50 | 50% | Nov 21, 2025 source file |
| Aurora St Lukes South Shore of Aurora Health Care Metro Cudahy, WI MAGNESIUM SERUM | $65.00 | $130.00 | $5.36–$110.50 | 50% | Nov 21, 2025 source file |
| Aurora West Allis Medical Center West Allis, WI · (414) 328-6000 MAGNESIUM SERUM | $65.00 | $130.00 | $5.36–$110.50 | 50% | Nov 21, 2025 source file |
| Children's Hospital of Wisconsin Milwaukee, WI · (414) 266-3954 HBC MAGNESIUM BLOOD | $70.81 | $128.75 | $90.13–$122.31 | 45% | Mar 23, 2026 source file |
| Children's Hospital of Wisconsin Milwaukee, WI · (414) 266-3954 HBC MAGNESIUM BLOOD | $70.81 | $128.75 | $90.13–$122.31 | 45% | Mar 23, 2026 source file |
| Aurora St Lukes Medical Center of Aurora Health Care Metro Milwaukee, WI · (414) 649-6000 MAGNESIUM, RBC'S | $75.00 | $150.00 | $5.36–$127.50 | 50% | Nov 21, 2025 source file |
| Aurora Sinai Medical Center of Aurora Health Care Metro Milwaukee, WI MAGNESIUM, RBC'S | $75.00 | $150.00 | $5.36–$127.50 | 50% | Nov 21, 2025 source file |
| Aurora West Allis Medical Center West Allis, WI · (414) 328-6000 MAGNESIUM, RBC'S | $75.00 | $150.00 | $5.36–$127.50 | 50% | Nov 21, 2025 source file |
| Aurora Medical Center Kenosha Kenosha, WI · (262) 948-5600 MAGNESIUM, RBC'S | $75.00 | $150.00 | $5.36–$127.50 | 50% | Nov 21, 2025 source file |
| Aurora Medical Center Washington County Hartford, WI · (262) 673-2300 MAGNESIUM, RBC'S | $75.00 | $150.00 | $5.36–$127.50 | 50% | Nov 21, 2025 source file |
| Aurora Medical Center Summit Summit, WI · (262) 434-1600 MAGNESIUM, RBC'S | $75.00 | $150.00 | $5.36–$127.50 | 50% | Nov 21, 2025 source file |
| Aurora Medical Center Grafton Grafton, WI · (262) 329-1000 MAGNESIUM, RBC'S | $75.00 | $150.00 | $5.36–$127.50 | 50% | Nov 21, 2025 source file |
| Aurora Psychiatric Hospital Wauwatosa, WI · (414) 454-6600 MAGNESIUM, RBC'S | $75.00 | $150.00 | $5.36–$127.50 | 50% | Nov 21, 2025 source file |
| Aurora St Lukes South Shore of Aurora Health Care Metro Cudahy, WI MAGNESIUM, RBC'S | $75.00 | $150.00 | $5.36–$127.50 | 50% | Nov 21, 2025 source file |
Outpatient: lowest $13.34, median $50.00, highest $57.77 — a 4.3× difference within the same market.
As an inpatient, the same code is billed by 13 facilities here, median $50.00. 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 10 of 17 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 it is
A magnesium test measures the level of magnesium in the blood. Doctors order it for muscle cramps or weakness, an irregular heartbeat, low potassium or calcium that does not correct, and for people on diuretics, long-term acid-reducing drugs or with kidney disease.
What the price covers
The price usually covers running the test. The blood draw (36415) is often billed as a separate line.