Magnesium test cost in Jacksonville, FL
In Jacksonville, FL, 10 hospitals list a cash price for magnesium blood test: from $5.00 to $184.83, with a median of $8.44. The lowest listed price is at Ascension St Vincent's Riverside and 3 other hospitals — $3.44 less than the median here. Across Florida, the median is $13.20 at 81 hospitals.
Cash prices at 10 facilities across 6 cities for code 83735, as an outpatient — the setting a self-pay patient normally buys. Collected Sep 24, 2026; the hospital files themselves were last updated between Feb 6, 2026 and Apr 1, 2026.
Lowest$5.00Ascension St Vincent's Riverside + 3 more
Median$8.44half pay less
Highest$184.83in this market
Difference37.0×highest vs lowest
Where each hospital's price falls
Each dot is one hospital's cash price on a scale from the lowest to the highest in Jacksonville, FL.
median
Lowest $5.00Highest $184.83
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list | File date |
|---|---|---|---|---|---|
| Ascension St Vincent's Riverside lowest Jacksonville, FL · (904) 308-7300 REF MAGNESIUM RBC-A | $5.00 | $13.50 | $2.70–$6.70 | 63% | — source file |
| Ascension St Vincent's Southside lowest Jacksonville, FL · (904) 296-3700 REF MAGNESIUM RBC-A | $5.00 | $13.50 | $2.70–$13.50 | 63% | — source file |
| St. Vincent's Medical Center-Clay County lowest Middleburg, FL · (904) 602-1000 REF MAGNESIUM RBC-A | $5.00 | $13.50 | $2.70–$13.50 | 63% | — source file |
| Ascension St Vincent's Riverside lowest Jacksonville, FL · (904) 308-7300 REF MAGNESIUM RBC-A | $5.00 | $13.50 | $2.70–$6.70 | 63% | — source file |
| Ascension St Vincent's St Johns County lowest Saint Johns, FL · (904) 450-6020 REF MAGNESIUM RBC-A | $5.00 | $13.50 | $2.70–$13.50 | 63% | — source file |
| St. Vincent's Medical Center-Clay County lowest Middleburg, FL · (904) 602-1000 REF MAGNESIUM RBC-A | $5.00 | $13.50 | $2.70–$13.50 | 63% | — source file |
| Ascension St Vincent's St Johns County lowest Saint Johns, FL · (904) 450-6020 REF MAGNESIUM RBC-A | $5.00 | $13.50 | $2.70–$13.50 | 63% | — source file |
| Ascension St Vincent's Southside lowest Jacksonville, FL · (904) 296-3700 REF MAGNESIUM RBC-A | $5.00 | $13.50 | $2.70–$13.50 | 63% | — source file |
| Ascension St Vincent's Riverside Jacksonville, FL · (904) 308-7300 MAGNESIUM FLUID | $7.03 | $19.00 | $3.80–$16.75 | 63% | — source file |
| Ascension St Vincent's Riverside Jacksonville, FL · (904) 308-7300 MAGNESIUM URINE (RANDOM) | $7.03 | $19.00 | $3.80–$16.75 | 63% | — source file |
| St. Vincent's Medical Center-Clay County Middleburg, FL · (904) 602-1000 MAGNESIUM URINE (RANDOM) | $7.03 | $19.00 | $3.80–$19.00 | 63% | — source file |
| St. Vincent's Medical Center-Clay County Middleburg, FL · (904) 602-1000 MAGNESIUM FLUID | $7.03 | $19.00 | $3.80–$19.00 | 63% | — source file |
| St. Vincent's Medical Center-Clay County Middleburg, FL · (904) 602-1000 MAGNESIUM URINE | $7.03 | $19.00 | $3.80–$19.00 | 63% | — source file |
| St. Vincent's Medical Center-Clay County Middleburg, FL · (904) 602-1000 MAGNESIUM URINE (RANDOM) | $7.03 | $19.00 | $3.80–$19.00 | 63% | — source file |
| St. Vincent's Medical Center-Clay County Middleburg, FL · (904) 602-1000 MAGNESIUM FLUID | $7.03 | $19.00 | $3.80–$19.00 | 63% | — source file |
| St. Vincent's Medical Center-Clay County Middleburg, FL · (904) 602-1000 MAGNESIUM URINE | $7.03 | $19.00 | $3.80–$19.00 | 63% | — source file |
| Ascension St Vincent's St Johns County Saint Johns, FL · (904) 450-6020 MAGNESIUM URINE (RANDOM) | $7.03 | $19.00 | $3.80–$19.00 | 63% | — source file |
| Ascension St Vincent's Southside Jacksonville, FL · (904) 296-3700 MAGNESIUM URINE | $7.03 | $19.00 | $3.80–$19.00 | 63% | — source file |
| Ascension St Vincent's Southside Jacksonville, FL · (904) 296-3700 MAGNESIUM FLUID | $7.03 | $19.00 | $3.80–$19.00 | 63% | — source file |
| Ascension St Vincent's Southside Jacksonville, FL · (904) 296-3700 MAGNESIUM URINE (RANDOM) | $7.03 | $19.00 | $3.80–$19.00 | 63% | — source file |
| Ascension St Vincent's Riverside Jacksonville, FL · (904) 308-7300 MAGNESIUM URINE | $7.03 | $19.00 | $3.80–$16.75 | 63% | — source file |
| Ascension St Vincent's Riverside Jacksonville, FL · (904) 308-7300 MAGNESIUM FLUID | $7.03 | $19.00 | $3.80–$16.75 | 63% | — source file |
| Ascension St Vincent's Riverside Jacksonville, FL · (904) 308-7300 MAGNESIUM URINE (RANDOM) | $7.03 | $19.00 | $3.80–$16.75 | 63% | — source file |
| Ascension St Vincent's Riverside Jacksonville, FL · (904) 308-7300 MAGNESIUM URINE | $7.03 | $19.00 | $3.80–$16.75 | 63% | — source file |
| Ascension St Vincent's Southside Jacksonville, FL · (904) 296-3700 MAGNESIUM URINE | $7.03 | $19.00 | $3.80–$19.00 | 63% | — source file |
| Ascension St Vincent's St Johns County Saint Johns, FL · (904) 450-6020 MAGNESIUM URINE | $7.03 | $19.00 | $3.80–$19.00 | 63% | — source file |
| Ascension St Vincent's St Johns County Saint Johns, FL · (904) 450-6020 MAGNESIUM FLUID | $7.03 | $19.00 | $3.80–$19.00 | 63% | — source file |
| Ascension St Vincent's St Johns County Saint Johns, FL · (904) 450-6020 MAGNESIUM URINE (RANDOM) | $7.03 | $19.00 | $3.80–$19.00 | 63% | — source file |
| Ascension St Vincent's St Johns County Saint Johns, FL · (904) 450-6020 MAGNESIUM URINE | $7.03 | $19.00 | $3.80–$19.00 | 63% | — source file |
| Ascension St Vincent's St Johns County Saint Johns, FL · (904) 450-6020 MAGNESIUM FLUID | $7.03 | $19.00 | $3.80–$19.00 | 63% | — source file |
| Ascension St Vincent's Southside Jacksonville, FL · (904) 296-3700 MAGNESIUM URINE (RANDOM) | $7.03 | $19.00 | $3.80–$19.00 | 63% | — source file |
| Ascension St Vincent's Southside Jacksonville, FL · (904) 296-3700 MAGNESIUM FLUID | $7.03 | $19.00 | $3.80–$19.00 | 63% | — source file |
| Baptist Health Medical Center - Jacksonville Jacksonville, FL · (904) 202-2000 HC ASSAY OF MAGNESIUM - RBC | $8.44 | $13.61 | $2.72–$13.34 | 38% | Feb 6, 2026 source file |
| Baptist Health Medical Center - Jacksonville Jacksonville, FL · (904) 202-2000 HC ASSAY OF MAGNESIUM - RBC | $8.44 | $13.61 | $2.72–$13.34 | 38% | Feb 6, 2026 source file |
| Southern Baptist Hospital of Florida Fleming Island, FL HC ASSAY OF MAGNESIUM - RBC | $8.44 | $13.61 | $2.72–$13.34 | 38% | Feb 6, 2026 source file |
| Baptist Medical Center of the Beaches Jacksonville Beach, FL · (904) 247-2900 HC ASSAY OF MAGNESIUM - RBC | $8.44 | $13.61 | $2.72–$13.34 | 38% | Feb 6, 2026 source file |
| Baptist Health Medical Center - Jacksonville Jacksonville, FL · (904) 202-2000 HC ASSAY OF MAGNESIUM - RBC | $8.44 | $13.61 | $2.86–$13.34 | 38% | Feb 6, 2026 source file |
| Baptist Medical Center of Nassau Fernandina Beach, FL · (904) 321-3500 HC ASSAY OF MAGNESIUM - RBC | $8.44 | $13.61 | $3.95–$13.34 | 38% | Feb 6, 2026 source file |
| Ascension St Vincent's St Johns County Saint Johns, FL · (904) 450-6020 MAGNESIUM BLOOD CHEMICAL | $40.05 | $108.25 | $5.90–$108.25 | 63% | — source file |
| Ascension St Vincent's Riverside Jacksonville, FL · (904) 308-7300 MAGNESIUM BLOOD CHEMICAL | $40.05 | $108.25 | $5.90–$40.05 | 63% | — source file |
| Ascension St Vincent's Riverside Jacksonville, FL · (904) 308-7300 MAGNESIUM BLOOD CHEMICAL | $40.05 | $108.25 | $5.90–$40.05 | 63% | — source file |
| Ascension St Vincent's St Johns County Saint Johns, FL · (904) 450-6020 MAGNESIUM BLOOD CHEMICAL | $40.05 | $108.25 | $5.90–$108.25 | 63% | — source file |
| Ascension St Vincent's Southside Jacksonville, FL · (904) 296-3700 MAGNESIUM BLOOD CHEMICAL | $40.05 | $108.25 | $5.90–$108.25 | 63% | — source file |
| Ascension St Vincent's Southside Jacksonville, FL · (904) 296-3700 MAGNESIUM BLOOD CHEMICAL | $40.05 | $108.25 | $5.90–$108.25 | 63% | — source file |
| St. Vincent's Medical Center-Clay County Middleburg, FL · (904) 602-1000 MAGNESIUM BLOOD CHEMICAL | $40.05 | $108.25 | $5.90–$108.25 | 63% | — source file |
| St. Vincent's Medical Center-Clay County Middleburg, FL · (904) 602-1000 MAGNESIUM BLOOD CHEMICAL | $40.05 | $108.25 | $5.90–$108.25 | 63% | — source file |
| University of Florida Health in Jacksonville Jacksonville, FL · (904) 244-4000 HB SO MAGNESIUM RBC | $40.47 | $73.58 | $3.01–$7.84 | 45% | Mar 31, 2026 source file |
| University of Florida Health in Jacksonville Jacksonville, FL · (904) 244-4000 HB MAGNESIUM | $41.94 | $76.26 | $3.01–$7.84 | 45% | Mar 31, 2026 source file |
| University of Florida Health in Jacksonville Jacksonville, FL · (904) 244-4000 HB MAGNESIUM, URINE (24HR) | $41.94 | $76.26 | $3.01–$7.84 | 45% | Mar 31, 2026 source file |
| Baptist Medical Center of the Beaches Jacksonville Beach, FL · (904) 247-2900 HC ASSAY OF MAGNESIUM - 24HR URINE | $66.96 | $108.00 | $21.60–$105.84 | 38% | Feb 6, 2026 source file |
| Baptist Health Medical Center - Jacksonville Jacksonville, FL · (904) 202-2000 HC ASSAY OF MAGNESIUM - URINE | $66.96 | $108.00 | $21.60–$105.84 | 38% | Feb 6, 2026 source file |
| Baptist Health Medical Center - Jacksonville Jacksonville, FL · (904) 202-2000 HC ASSAY OF MAGNESIUM - BLOOD | $66.96 | $108.00 | $21.60–$105.84 | 38% | Feb 6, 2026 source file |
| Baptist Health Medical Center - Jacksonville Jacksonville, FL · (904) 202-2000 HC ASSAY OF MAGNESIUM - 24HR URINE | $66.96 | $108.00 | $21.60–$105.84 | 38% | Feb 6, 2026 source file |
| Baptist Health Medical Center - Jacksonville Jacksonville, FL · (904) 202-2000 HC ASSAY OF MAGNESIUM - URINE | $66.96 | $108.00 | $21.60–$105.84 | 38% | Feb 6, 2026 source file |
| Baptist Medical Center of Nassau Fernandina Beach, FL · (904) 321-3500 HC ASSAY OF MAGNESIUM - URINE | $66.96 | $108.00 | $31.32–$105.84 | 38% | Feb 6, 2026 source file |
| Baptist Health Medical Center - Jacksonville Jacksonville, FL · (904) 202-2000 HC ASSAY OF MAGNESIUM - BLOOD | $66.96 | $108.00 | $21.60–$105.84 | 38% | Feb 6, 2026 source file |
| Baptist Health Medical Center - Jacksonville Jacksonville, FL · (904) 202-2000 HC ASSAY OF MAGNESIUM - 24HR URINE | $66.96 | $108.00 | $22.68–$105.84 | 38% | Feb 6, 2026 source file |
| Baptist Health Medical Center - Jacksonville Jacksonville, FL · (904) 202-2000 HC ASSAY OF MAGNESIUM - BLOOD | $66.96 | $108.00 | $22.68–$105.84 | 38% | Feb 6, 2026 source file |
| Baptist Health Medical Center - Jacksonville Jacksonville, FL · (904) 202-2000 HC ASSAY OF MAGNESIUM - 24HR URINE | $66.96 | $108.00 | $21.60–$105.84 | 38% | Feb 6, 2026 source file |
| Baptist Medical Center of the Beaches Jacksonville Beach, FL · (904) 247-2900 HC ASSAY OF MAGNESIUM - URINE | $66.96 | $108.00 | $21.60–$105.84 | 38% | Feb 6, 2026 source file |
| Baptist Health Medical Center - Jacksonville Jacksonville, FL · (904) 202-2000 HC ASSAY OF MAGNESIUM - URINE | $66.96 | $108.00 | $22.68–$105.84 | 38% | Feb 6, 2026 source file |
| Southern Baptist Hospital of Florida Fleming Island, FL HC ASSAY OF MAGNESIUM - BLOOD | $66.96 | $108.00 | $21.60–$105.84 | 38% | Feb 6, 2026 source file |
| Southern Baptist Hospital of Florida Fleming Island, FL HC ASSAY OF MAGNESIUM - URINE | $66.96 | $108.00 | $21.60–$105.84 | 38% | Feb 6, 2026 source file |
| Southern Baptist Hospital of Florida Fleming Island, FL HC ASSAY OF MAGNESIUM - 24HR URINE | $66.96 | $108.00 | $21.60–$105.84 | 38% | Feb 6, 2026 source file |
| Baptist Medical Center of Nassau Fernandina Beach, FL · (904) 321-3500 HC ASSAY OF MAGNESIUM - 24HR URINE | $66.96 | $108.00 | $31.32–$105.84 | 38% | Feb 6, 2026 source file |
| Baptist Medical Center of the Beaches Jacksonville Beach, FL · (904) 247-2900 HC ASSAY OF MAGNESIUM - BLOOD | $66.96 | $108.00 | $21.60–$105.84 | 38% | Feb 6, 2026 source file |
| Baptist Medical Center of Nassau Fernandina Beach, FL · (904) 321-3500 HC ASSAY OF MAGNESIUM - BLOOD | $66.96 | $108.00 | $31.32–$105.84 | 38% | Feb 6, 2026 source file |
| Reunion Rehabilitation Hospital Jacksonville Jacksonville, FL Assay of Magnesium, RBC | $184.83 | $184.83 | — | — | Apr 1, 2026 source file |
| Reunion Rehabilitation Hospital Jacksonville Jacksonville, FL Assay of magnesium | $184.83 | $184.83 | — | — | Apr 1, 2026 source file |
Outpatient: lowest $5.00, median $8.44, highest $184.83 — a 37.0× difference within the same market.
As an inpatient, the same code is billed by 6 facilities here, median $5.00. 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 8 of 9 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.