Magnesium test cost in Cape Girardeau, MO
In Cape Girardeau, MO-IL, 2 hospitals list a cash price for magnesium blood test: from $18.75 to $31.85, with a median of $25.30. The lowest listed price is at Mercy Hospital Southeast — $6.55 less than the median here. Across Missouri, the median is $36.63 at 30 hospitals.
Cash prices at 2 facilities 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 Jun 12, 2026 and Jun 12, 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 Cape Girardeau, MO-IL.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list | File date |
|---|---|---|---|---|---|
| Mercy Hospital Southeast lowest Cape Girardeau, MO Stone Risk Ua Magnesium | $18.75 | $25.00 | $2.80–$18.72 | 25% | Jun 12, 2026 source file |
| Mercy Hospital Southeast lowest Cape Girardeau, MO Magnesium | $18.75 | $25.00 | $2.80–$18.72 | 25% | Jun 12, 2026 source file |
| Mercy Hospital Southeast lowest Cape Girardeau, MO Magnesium 24 Hr Urine | $18.75 | $25.00 | $2.80–$18.72 | 25% | Jun 12, 2026 source file |
| Mercy Hospital Southeast lowest Cape Girardeau, MO Magnesium RBC | $18.75 | $25.00 | $2.80–$18.72 | 25% | Jun 12, 2026 source file |
| Mercy Hospital Southeast lowest Cape Girardeau, MO Magnesium Stool | $18.75 | $25.00 | $2.80–$18.72 | 25% | Jun 12, 2026 source file |
| Mercy Hospital Southeast lowest Cape Girardeau, MO Magnesium Urine | $18.75 | $25.00 | $2.80–$18.72 | 25% | Jun 12, 2026 source file |
| Mercy Hospital Southeast lowest Cape Girardeau, MO Assay of Magnesium | $18.75 | $25.00 | $2.80–$18.72 | 25% | Jun 12, 2026 source file |
| Mercy Hospital Southeast lowest Cape Girardeau, MO Magnesium | $18.75 | $25.00 | $2.80–$18.72 | 25% | Jun 12, 2026 source file |
| Mercy Hospital Southeast lowest Cape Girardeau, MO Magnesium 24 Hr Urine | $18.75 | $25.00 | $2.80–$18.72 | 25% | Jun 12, 2026 source file |
| Mercy Hospital Southeast lowest Cape Girardeau, MO Magnesium RBC | $18.75 | $25.00 | $2.80–$18.72 | 25% | Jun 12, 2026 source file |
| Mercy Hospital Southeast lowest Cape Girardeau, MO Magnesium Stool | $18.75 | $25.00 | $2.80–$18.72 | 25% | Jun 12, 2026 source file |
| Mercy Hospital Southeast lowest Cape Girardeau, MO Magnesium Urine | $18.75 | $25.00 | $2.80–$18.72 | 25% | Jun 12, 2026 source file |
| Mercy Hospital Southeast lowest Cape Girardeau, MO Stone Risk Ua Magnesium | $18.75 | $25.00 | $2.80–$18.72 | 25% | Jun 12, 2026 source file |
| Mercy Hospital Southeast lowest Cape Girardeau, MO Assay of Magnesium | $18.75 | $25.00 | $2.80–$18.72 | 25% | Jun 12, 2026 source file |
| Mercy Hospital Southeast Cape Girardeau, MO · (573) 334-4822 Stone Risk Ua Magnesium | $31.85 | $49.00 | $6.03–$30.93 | 35% | — source file |
| Mercy Hospital Southeast Cape Girardeau, MO · (573) 334-4822 Magnesium 24 Hr Urine | $67.60 | $104.00 | $6.03–$30.93 | 35% | — source file |
| Mercy Hospital Southeast Cape Girardeau, MO · (573) 334-4822 Magnesium Urine | $117.00 | $180.00 | $6.03–$30.93 | 35% | — source file |
| Mercy Hospital Southeast Cape Girardeau, MO · (573) 334-4822 Magnesium | $129.35 | $199.00 | $6.03–$30.93 | 35% | — source file |
| Mercy Hospital Southeast Cape Girardeau, MO · (573) 334-4822 Magnesium RBC | $192.40 | $296.00 | $6.03–$30.93 | 35% | — source file |
Outpatient: lowest $18.75, median $25.30, highest $31.85 — a 1.7× difference within the same market.
As an inpatient, the same code is billed by 1 facility here, median $18.75. 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 0 of 2 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.