Magnesium test cost in Buffalo, NY
In Buffalo-Cheektowaga, NY, 6 hospitals list a cash price for Magnesium blood test: from $5.03 to $74.93, with a median of $10.15. The lowest listed price is at Mount St. Mary's Hospital and 2 other hospitals — $5.12 less than the median here. Across New York, the median is $27.88 at 64 hospitals.
Cash prices at 6 facilities across 3 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 Apr 1, 2026 and Aug 25, 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 Buffalo-Cheektowaga, NY.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list | File date |
|---|---|---|---|---|---|
| Mount St. Mary's Hospital lowest Lewiston, NY HC Assay of Magnesium - Magnesium | $5.03 | $16.00 | $5.03–$16.00 | 69% | — source file |
| Sisters of Charity Hospital lowest Buffalo, NY HC Assay of Magnesium - Magnesium | $5.03 | $16.00 | $5.03–$16.00 | 69% | — source file |
| Mercy Hospital of Buffalo lowest Buffalo, NY HC Assay of Magnesium - Magnesium | $5.03 | $16.00 | $5.03–$16.00 | 69% | — source file |
| Niagara Falls Memorial Medical Center Niagara Falls, NY ASSAY OF MAGNESIUM | $15.26 | $21.80 | $6.36–$9.13 | 30% | — source file |
| Sisters of Charity Hospital Buffalo, NY HC Assay of Magnesium - Magnesium RBC | $16.00 | $16.00 | $5.03–$16.00 | — | — source file |
| Mercy Hospital of Buffalo Buffalo, NY HC Assay of Magnesium - Magnesium RBC | $16.00 | $16.00 | $5.03–$16.00 | — | — source file |
| Sisters of Charity Hospital Buffalo, NY HC Assay of Magnesium - Magnesium Urine | $16.00 | $16.00 | $5.03–$16.00 | — | — source file |
| Mount St. Mary's Hospital Lewiston, NY HC Assay of Magnesium - Magnesium Urine | $16.00 | $16.00 | $5.03–$16.00 | — | — source file |
| Mount St. Mary's Hospital Lewiston, NY HC Assay of Magnesium - Magnesium RBC | $16.00 | $16.00 | $5.03–$16.00 | — | — source file |
| Mercy Hospital of Buffalo Buffalo, NY HC Assay of Magnesium - Magnesium Urine | $16.00 | $16.00 | $5.03–$16.00 | — | — source file |
| Niagara Falls Memorial Medical Center Niagara Falls, NY MAGNESIUM LEVEL | $19.33 | $27.61 | $6.37–$9.13 | 30% | — source file |
| Erie County Medical Center Corporation Buffalo, NY URINE MAGNESIUM 24 HOURS | $28.53 | $60.67 | $5.03–$54.60 | 53% | Aug 25, 2026 source file |
| Erie County Medical Center Corporation Buffalo, NY URINE MAGNESIUM | $28.53 | $60.67 | $5.03–$54.60 | 53% | Aug 25, 2026 source file |
| Erie County Medical Center Corporation Buffalo, NY MAGNESIUM SERUM | $28.53 | $60.67 | $5.03–$54.60 | 53% | Aug 25, 2026 source file |
| Erie County Medical Center Corporation Buffalo, NY MAGNESIUM RBC | $28.53 | $60.67 | $5.03–$54.60 | 53% | Aug 25, 2026 source file |
| Roswell Park Cancer Institute Buffalo, NY Cp Magnesium | $74.93 | $74.93 | — | — | Apr 1, 2026 source file |
| Roswell Park Cancer Institute Buffalo, NY Magnesium | $74.93 | $74.93 | — | — | Apr 1, 2026 source file |
| Roswell Park Cancer Institute Buffalo, NY Urine Magnesium 24 Hour | $74.93 | $74.93 | — | — | Apr 1, 2026 source file |
Outpatient: lowest $5.03, median $10.15, highest $74.93 — a 14.9× difference within the same market.
As an inpatient, the same code is billed by 5 facilities here, median $5.03. 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 4 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 none is it 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.