Magnesium test cost in Spokane, WA — inpatient
In Spokane-Spokane Valley, WA, 3 hospitals list a cash price for magnesium blood test as an inpatient: from $26.60 to $50.40, with a median of $34.65. The lowest listed price is at Providence Mount Carmel Hospital — $8.05 less than the median here. Across Washington, the median is $49.20 at 33 hospitals.
Cash prices at 3 facilities across 3 cities for code 83735, as an inpatient (admitted to hospital) . Collected Sep 23, 2026; the hospital files themselves were last updated between Apr 1, 2026 and Apr 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 Spokane-Spokane Valley, WA.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list | File date |
|---|---|---|---|---|---|
| Providence Mount Carmel Hospital lowest Colville, WA · (509) 684-2561 HC MAGNESIUM (24HR UR) | $26.60 | $38.00 | — | 30% | Apr 1, 2026 source file |
| Providence Mount Carmel Hospital lowest Colville, WA · (509) 684-2561 HC MAGNESIUM QUANT URINE | $26.60 | $38.00 | — | 30% | Apr 1, 2026 source file |
| Providence Holy Family Hospital Spokane, WA · (509) 482-0111 HC MAGNESIUM QUANT URINE | $34.65 | $49.50 | — | 30% | Apr 1, 2026 source file |
| Providence Mount Carmel Hospital Colville, WA · (509) 684-2561 HC ASSAY OF MAGNESIUM LAB | $43.40 | $62.00 | — | 30% | Apr 1, 2026 source file |
| Providence Holy Family Hospital Spokane, WA · (509) 482-0111 HC MAGNESIUM QUANT URINE | $45.50 | $65.00 | — | 30% | Apr 1, 2026 source file |
| Providence Holy Family Hospital Spokane, WA · (509) 482-0111 HC MAGNESIUM (24HR UR) | $45.50 | $65.00 | — | 30% | Apr 1, 2026 source file |
| Providence Holy Family Hospital Spokane, WA · (509) 482-0111 HC ASSAY OF MAGNESIUM CDM | $45.50 | $65.00 | — | 30% | Apr 1, 2026 source file |
| Providence Holy Family Hospital Spokane, WA · (509) 482-0111 HC ASSAY OF MAGNESIUM | $45.50 | $65.00 | — | 30% | Apr 1, 2026 source file |
| Providence St Joseph Hospital Chewelah, WA · (509) 935-8211 HC MAGNESIUM (24HR UR) | $50.40 | $72.00 | — | 30% | Apr 1, 2026 source file |
| Providence St Joseph Hospital Chewelah, WA · (509) 935-8211 HC MAGNESIUM QUANT URINE | $50.40 | $72.00 | — | 30% | Apr 1, 2026 source file |
| Providence St Joseph Hospital Chewelah, WA · (509) 935-8211 HC ASSAY OF MAGNESIUM | $50.40 | $72.00 | — | 30% | Apr 1, 2026 source file |
| Providence St Joseph Hospital Chewelah, WA · (509) 935-8211 HC ASSAY OF MAGNESIUM CDM | $50.40 | $72.00 | — | 30% | Apr 1, 2026 source file |
| Providence Holy Family Hospital Spokane, WA · (509) 482-0111 HC MAGNESIUM RBC | $53.90 | $77.00 | — | 30% | Apr 1, 2026 source file |
| Providence Holy Family Hospital Spokane, WA · (509) 482-0111 HC ASSAY OF MAGNESIUM | $56.70 | $81.00 | — | 30% | Apr 1, 2026 source file |
| Providence Holy Family Hospital Spokane, WA · (509) 482-0111 HC MAGNESIUM RBC | $56.70 | $81.00 | — | 30% | Apr 1, 2026 source file |
| Providence Holy Family Hospital Spokane, WA · (509) 482-0111 HC MAGNESIUM QUANT URINE | $56.70 | $81.00 | — | 30% | Apr 1, 2026 source file |
| Providence Holy Family Hospital Spokane, WA · (509) 482-0111 HC ASSAY OF MAGNESIUM CDM | $56.70 | $81.00 | — | 30% | Apr 1, 2026 source file |
| Providence Holy Family Hospital Spokane, WA · (509) 482-0111 HC MAGNESIUM (24HR UR) | $56.70 | $81.00 | — | 30% | Apr 1, 2026 source file |
| Providence St Joseph Hospital Chewelah, WA · (509) 935-8211 HC MAGNESIUM RBC | $58.10 | $83.00 | — | 30% | Apr 1, 2026 source file |
| Providence Mount Carmel Hospital Colville, WA · (509) 684-2561 HC ASSAY OF MAGNESIUM | $60.20 | $86.00 | — | 30% | Apr 1, 2026 source file |
| Providence Mount Carmel Hospital Colville, WA · (509) 684-2561 HC ASSAY OF MAGNESIUM CDM | $60.20 | $86.00 | — | 30% | Apr 1, 2026 source file |
| Providence Mount Carmel Hospital Colville, WA · (509) 684-2561 HC MAGNESIUM RBC | $67.90 | $97.00 | — | 30% | Apr 1, 2026 source file |
| Providence Holy Family Hospital Spokane, WA · (509) 482-0111 HC ASSAY OF MAGNESIUM CDM | $102.69 | $146.70 | — | 30% | Apr 1, 2026 source file |
Inpatient: lowest $26.60, median $34.65, highest $50.40 — a 1.9× difference within the same market.
As an outpatient, the same code is billed by 4 facilities here, median $42.53 — that is the price to compare if you are not being admitted.
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.