Magnesium test cost in Columbia, MO — inpatient
In Columbia, MO, 2 hospitals list a cash price for magnesium blood test as an inpatient: from $23.56 to $33.45, with a median of $28.51. The lowest listed price is at Boone Hospital Center — $4.95 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 inpatient (admitted to hospital) . Collected Sep 22, 2026; the hospital files themselves were last updated between Dec 15, 2025 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 Columbia, MO.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list | File date |
|---|---|---|---|---|---|
| Boone Hospital Center lowest Columbia, MO · (573) 815-8000 MAGNESIUM | $23.56 | $39.27 | — | 40% | Apr 1, 2026 source file |
| Boone Hospital Center Columbia, MO · (573) 815-8000 MAGNESIUM 24 HR UR | $28.20 | $47.00 | — | 40% | Apr 1, 2026 source file |
| Boone Hospital Center Columbia, MO · (573) 815-8000 MAGNESIUM URINE | $28.20 | $47.00 | — | 40% | Apr 1, 2026 source file |
| Boone Hospital Center Columbia, MO · (573) 815-8000 MAGNESIUM BODY FLUID | $28.20 | $47.00 | — | 40% | Apr 1, 2026 source file |
| Curators of the University of Missouri Columbia, MO · (573) 882-4141 MAGNESIUM LEVEL P31025164 | $33.45 | $55.75 | $15.16–$49.06 | 40% | Dec 15, 2025 source file |
| Curators of the University of Missouri Columbia, MO · (573) 882-4141 MAGNESIUM LEVEL P28625164 | $33.45 | $55.75 | $15.16–$49.06 | 40% | Dec 15, 2025 source file |
| Curators of the University of Missouri Columbia, MO · (573) 882-4141 MAGNESIUM IONIZED P28620270 | $33.45 | $55.75 | $15.16–$49.06 | 40% | Dec 15, 2025 source file |
| Curators of the University of Missouri Columbia, MO · (573) 882-4141 MAGNESIUM P31030379 | $41.70 | $69.50 | $18.90–$61.16 | 40% | Dec 15, 2025 source file |
| Curators of the University of Missouri Columbia, MO · (573) 882-4141 MAGNESIUM P28630379 | $41.70 | $69.50 | $18.90–$61.16 | 40% | Dec 15, 2025 source file |
| Curators of the University of Missouri Columbia, MO · (573) 882-4141 URINE TOTAL VOLUME MAGNESIUM P28620287 | $41.97 | $69.95 | $19.03–$61.56 | 40% | Dec 15, 2025 source file |
| Curators of the University of Missouri Columbia, MO · (573) 882-4141 ELECTROLYTE OSMOLALITY PANEL MAGNESIUM (EFPO) 3/6 P28632672 | $44.82 | $74.70 | $20.32–$65.74 | 40% | Dec 15, 2025 source file |
| Curators of the University of Missouri Columbia, MO · (573) 882-4141 ASSAY OF MAGNESIUM (MAYO) P28636027 | $44.82 | $74.70 | $20.32–$65.74 | 40% | Dec 15, 2025 source file |
| Curators of the University of Missouri Columbia, MO · (573) 882-4141 ELECTROLYTE OSMOLALITY PANEL MAGNESIUM (EFPO) 3/6 P31032672 | $44.82 | $74.70 | $20.32–$65.74 | 40% | Dec 15, 2025 source file |
| Curators of the University of Missouri Columbia, MO · (573) 882-4141 ASSAY OF MAGNESIUM (MAYO) P31036027 | $44.82 | $74.70 | $20.32–$65.74 | 40% | Dec 15, 2025 source file |
| Curators of the University of Missouri Columbia, MO · (573) 882-4141 CATHARTIC LAXATIVES PROFILE, STOOL (FCLPF) 83735 P28637001 | $217.95 | $363.25 | $98.80–$319.66 | 40% | Dec 15, 2025 source file |
Inpatient: lowest $23.56, median $28.51, highest $33.45 — a 1.4× difference within the same market.
As an outpatient, the same code is billed by 2 facilities here, median $28.51 — that is the price to compare if you are not being admitted.
Cash or insurance?
At the one hospital here that publishes insurer rates for this code, the cash price is below the highest rate a health plan has negotiated. 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.