Magnesium test cost in Davenport, IA — inpatient
In Davenport-Moline-Rock Island, IA-IL, 4 hospitals list a cash price for magnesium blood test as an inpatient: from $16.80 to $48.60, with a median of $19.50. The lowest listed price is at Trinity Medical Center and 1 other hospital — $2.70 less than the median here. Across Iowa, the median is $43.80 at 37 hospitals.
Cash prices at 4 facilities across 4 cities for code 83735, as an inpatient (admitted to hospital) . Collected Sep 23, 2026; the hospital files themselves were last updated between Jan 28, 2026 and Mar 31, 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 Davenport-Moline-Rock Island, IA-IL.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list | File date |
|---|---|---|---|---|---|
| Trinity Medical Center lowest Rock Island, IL ASSAY OF MAGNESIUM | $16.80 | $21.00 | $4.02–$12.74 | 20% | Jan 28, 2026 source file |
| Trinity Medical Center lowest Bettendorf, IA ASSAY OF MAGNESIUM | $16.80 | $21.00 | $4.02–$12.74 | 20% | Jan 28, 2026 source file |
| MercyOne Genesis Aledo Medical Center Aledo, IL Magnesium Urine - Sendout | $22.20 | $37.00 | $17.02–$27.01 | 40% | Mar 31, 2026 source file |
| MercyOne Genesis Aledo Medical Center Aledo, IL Magnesium, 24-Hour Urine (W/O Creatinine) - Quest | $24.00 | $40.00 | $18.40–$29.20 | 40% | Mar 31, 2026 source file |
| Trinity Medical Center Rock Island, IL HC MAGNESIUM | $33.57 | $41.96 | $22.11 | 20% | Jan 28, 2026 source file |
| Trinity Medical Center Bettendorf, IA HC MAGNESIUM | $33.57 | $41.96 | $22.11 | 20% | Jan 28, 2026 source file |
| MercyOne Genesis Aledo Medical Center Aledo, IL Magnesium RBC - Sendout | $34.80 | $58.00 | $26.10–$42.34 | 40% | Mar 31, 2026 source file |
| MercyOne Genesis Silvis Medical Center Silvis, IL Magnesium Urine - Sendout | $48.60 | $81.00 | $25.92–$74.52 | 40% | Mar 31, 2026 source file |
| MercyOne Genesis Silvis Medical Center Silvis, IL Magnesium RBC - Sendout | $48.60 | $81.00 | $25.92–$74.52 | 40% | Mar 31, 2026 source file |
| MercyOne Genesis Silvis Medical Center Silvis, IL Magnesium, 24-Hour Urine (W/O Creatinine) - Quest | $48.60 | $81.00 | $25.92–$74.52 | 40% | Mar 31, 2026 source file |
| MercyOne Genesis Aledo Medical Center Aledo, IL Magnesium Level - OB | $61.20 | $102.00 | $46.92–$74.46 | 40% | Mar 31, 2026 source file |
| MercyOne Genesis Silvis Medical Center Silvis, IL Magnesium Level - OB | $61.20 | $102.00 | $32.64–$93.84 | 40% | Mar 31, 2026 source file |
| MercyOne Genesis Silvis Medical Center Silvis, IL MAGNESIUM | $61.20 | $102.00 | $32.64–$93.84 | 40% | Mar 31, 2026 source file |
| MercyOne Genesis Silvis Medical Center Silvis, IL GHS MAGNESIUM | $61.20 | $102.00 | $32.64–$93.84 | 40% | Mar 31, 2026 source file |
| MercyOne Genesis Aledo Medical Center Aledo, IL Magnesium Level | $61.20 | $102.00 | $46.92–$74.46 | 40% | Mar 31, 2026 source file |
| MercyOne Genesis Silvis Medical Center Silvis, IL Magnesium Level | $61.20 | $102.00 | $32.64–$93.84 | 40% | Mar 31, 2026 source file |
| MercyOne Genesis Aledo Medical Center Aledo, IL MAGNESIUM | $61.20 | $102.00 | $46.92–$74.46 | 40% | Mar 31, 2026 source file |
| MercyOne Genesis Aledo Medical Center Aledo, IL GHS MAGNESIUM | $61.20 | $102.00 | $46.92–$74.46 | 40% | Mar 31, 2026 source file |
| MercyOne Genesis Aledo Medical Center Aledo, IL GHS MAGNESIUM, 24HR URINE | $64.80 | $108.00 | $49.68–$78.84 | 40% | Mar 31, 2026 source file |
| MercyOne Genesis Silvis Medical Center Silvis, IL GHS MAGNESIUM, 24HR URINE | $64.80 | $108.00 | $34.56–$99.36 | 40% | Mar 31, 2026 source file |
Inpatient: lowest $16.80, median $19.50, highest $48.60 — a 2.9× difference within the same market.
As an outpatient, the same code is billed by 6 facilities here, median $33.00 — that is the price to compare if you are not being admitted.
Cash or insurance?
At 2 of 4 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.