Magnesium test cost in Jacksonville, FL
In Jacksonville, FL, 13 hospitals list a cash price for magnesium blood test: from $5.00 to $131.87, with a median of $8.44. The lowest listed price is at St. Vincent's Medical Center-Clay County and 3 other hospitals — $3.44 less than the median here. Across Florida, the median is $13.25 at 171 hospitals.
- The median here, $8.44, is 80% below the US median of $41.60.
- That is 1.3× Medicare's 2026 national rate for the same service ($6.70).
- Jacksonville, FL ranks 2nd of 4 metro areas in Florida by median, cheapest first.
- 3 of 13 hospitals list a cash price equal to their full list price, with no self-pay discount.
Cash prices at 13 facilities across 7 cities for code 83735, as an outpatient — the setting a self-pay patient normally buys. Collected Oct 31, 2026; the hospital files themselves were last updated between Nov 12, 2025 and Sep 1, 2026.
Lowest$5.00St. Vincent's Medical Center-Clay County + 3 more
Median$8.44half of hospitals charge less
Highest$131.87in this market
Difference26.4×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 $968.22
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list |
|---|---|---|---|---|
| St. Vincent's Medical Center-Clay County lowest Middleburg, FL · (904) 602-1000 REF MAGNESIUM RBC-A+1 more line at this price File of Jan 1, 2026 · source file | $5.00 | $13.50 | $2.70–$13.50 | 63% |
| Ascension St Vincent's St Johns County lowest Saint Johns, FL · (904) 450-6020 REF MAGNESIUM RBC-A+1 more line at this price File of Jan 1, 2026 · source file | $5.00 | $13.50 | $2.70–$13.50 | 63% |
| Ascension St Vincent's Riverside lowest Jacksonville, FL · (904) 308-7300 REF MAGNESIUM RBC-A+1 more line at this price File of Jan 1, 2026 · source file | $5.00 | $13.50 | $2.70–$6.70 | 63% |
| Ascension St Vincent's Southside lowest Jacksonville, FL · (904) 296-3700 REF MAGNESIUM RBC-A+1 more line at this price File of Jan 1, 2026 · source file | $5.00 | $13.50 | $2.70–$13.50 | 63% |
| Ascension St Vincent's Riverside Jacksonville, FL · (904) 308-7300 MAGNESIUM URINE (RANDOM)+5 more lines at this price File of Jan 1, 2026 · source file | $7.03 | $19.00 | $3.80–$16.75 | 63% |
| Ascension St Vincent's Southside Jacksonville, FL · (904) 296-3700 MAGNESIUM FLUID+5 more lines at this price File of Jan 1, 2026 · source file | $7.03 | $19.00 | $3.80–$19.00 | 63% |
| St. Vincent's Medical Center-Clay County Middleburg, FL · (904) 602-1000 MAGNESIUM URINE+5 more lines at this price File of Jan 1, 2026 · source file | $7.03 | $19.00 | $3.80–$19.00 | 63% |
| Ascension St Vincent's St Johns County Saint Johns, FL · (904) 450-6020 MAGNESIUM URINE (RANDOM)+5 more lines at this price File of Jan 1, 2026 · source file | $7.03 | $19.00 | $3.80–$19.00 | 63% |
| Baptist Medical Center of Nassau Fernandina Beach, FL · (904) 321-3500 HC ASSAY OF MAGNESIUM - RBC File of Feb 6, 2026 · source file | $8.44 | $13.61 | $3.95–$13.34 | 38% |
| Baptist Health Medical Center - Jacksonville Fleming Island, FL · (904) 202-2000 HC ASSAY OF MAGNESIUM - RBC File of Feb 6, 2026 · source file | $8.44 | $13.61 | $2.72–$13.34 | 38% |
| Baptist Medical Center of the Beaches Jacksonville Beach, FL · (904) 247-2900 HC ASSAY OF MAGNESIUM - RBC File of Feb 6, 2026 · source file | $8.44 | $13.61 | $2.72–$13.34 | 38% |
| Baptist Health Medical Center - Jacksonville Jacksonville, FL · (904) 202-2000 HC ASSAY OF MAGNESIUM - RBC+1 more line at this price File of Feb 6, 2026 · source file | $8.44 | $13.61 | $2.72–$13.34 | 38% |
| Baptist Medical Center South Jacksonville, FL · (904) 202-2000 HC ASSAY OF MAGNESIUM - RBC File of Feb 6, 2026 · source file | $8.44 | $13.61 | $2.72–$13.34 | 38% |
| Ascension St Vincent's St Johns County Saint Johns, FL · (904) 450-6020 MAGNESIUM BLOOD CHEMICAL+1 more line at this price File of Jan 1, 2026 · source file | $40.05 | $108.25 | $5.90–$108.25 | 63% |
| St. Vincent's Medical Center-Clay County Middleburg, FL · (904) 602-1000 MAGNESIUM BLOOD CHEMICAL+1 more line at this price File of Jan 1, 2026 · source file | $40.05 | $108.25 | $5.90–$108.25 | 63% |
| Ascension St Vincent's Riverside Jacksonville, FL · (904) 308-7300 MAGNESIUM BLOOD CHEMICAL+1 more line at this price File of Jan 1, 2026 · source file | $40.05 | $108.25 | $5.90–$40.05 | 63% |
| Ascension St Vincent's Southside Jacksonville, FL · (904) 296-3700 MAGNESIUM BLOOD CHEMICAL+1 more line at this price File of Jan 1, 2026 · source file | $40.05 | $108.25 | $5.90–$108.25 | 63% |
| University of Florida Health in Jacksonville Jacksonville, FL · (904) 244-4000 HB SO MAGNESIUM RBC File of Mar 31, 2026 · source file | $40.47 | $73.58 | $3.01–$7.84 | 45% |
| University of Florida Health in Jacksonville Jacksonville, FL · (904) 244-4000 HB MAGNESIUM, URINE (24HR)+1 more line at this price File of Mar 31, 2026 · source file | $41.94 | $76.26 | $3.01–$7.84 | 45% |
| Baptist Medical Center of Nassau Fernandina Beach, FL · (904) 321-3500 HC ASSAY OF MAGNESIUM - BLOOD+2 more lines at this price File of Feb 6, 2026 · source file | $66.96 | $108.00 | $31.32–$105.84 | 38% |
| Baptist Health Medical Center - Jacksonville Jacksonville, FL · (904) 202-2000 HC ASSAY OF MAGNESIUM - URINE+5 more lines at this price File of Feb 6, 2026 · source file | $66.96 | $108.00 | $21.60–$105.84 | 38% |
| Baptist Health Medical Center - Jacksonville Fleming Island, FL · (904) 202-2000 HC ASSAY OF MAGNESIUM - 24HR URINE+2 more lines at this price File of Feb 6, 2026 · source file | $66.96 | $108.00 | $21.60–$105.84 | 38% |
| Baptist Medical Center South Jacksonville, FL · (904) 202-2000 HC ASSAY OF MAGNESIUM - URINE+2 more lines at this price File of Feb 6, 2026 · source file | $66.96 | $108.00 | $21.60–$105.84 | 38% |
| Baptist Medical Center of the Beaches Jacksonville Beach, FL · (904) 247-2900 HC ASSAY OF MAGNESIUM - 24HR URINE+2 more lines at this price File of Feb 6, 2026 · source file | $66.96 | $108.00 | $21.60–$105.84 | 38% |
| HCA Florida Memorial Hospital Jacksonville, FL · (904) 702-6111 MAGNESIUM IONIZED File of Sep 1, 2026 · source file | $72.00 | $72.00 | $6.05–$64.80 | — |
| ED Fraser Memorial Hospital Macclenny, FL · (904) 259-3151 MAGNESIUM File of Nov 12, 2025 · source file | $77.00 | $77.00 | $6.57–$61.60 | — |
| HCA Florida Orange Park Hospital Middleburg, FL · (904) 276-8500 MAGNESIUM URINE File of Sep 1, 2026 · source file | $131.87 | $131.87 | $11.08–$118.68 | — |
| ED Fraser Memorial Hospital Macclenny, FL · (904) 259-3151 MAGNESIUM RBC File of Nov 12, 2025 · source file | $163.00 | $163.00 | $6.57 | — |
| HCA Florida Memorial Hospital Jacksonville, FL · (904) 702-6111 MAGNESIUM URINE+1 more line at this price File of Sep 1, 2026 · source file | $882.00 | $882.00 | $74.09–$793.80 | — |
| HCA Florida Orange Park Hospital Middleburg, FL · (904) 276-8500 MAGNESIUM BLD File of Sep 1, 2026 · source file | $968.22 | $968.22 | $81.33–$871.40 | — |
Hospital The hospital that published the price, its city and the line exactly as written in its price file.
Cash price The hospital's own price for a patient paying without insurance (“discounted cash” in its price file). Hospitals must publish it under federal law, 45 CFR 180.50. Call to confirm it before booking. More
List price The hospital's full chargemaster price (“gross charge”) before any discount. Almost nobody pays it; the gap to the cash price shows what the self-pay discount is worth. More
Insurers pay The lowest and highest rates this hospital has agreed with insurance plans for the same item, from its price file. If the cash price is below what your plan pays and you have not met your deductible, paying cash can cost you less. More
Off list How much lower the cash price is than the list price.
No cash discount This line's cash price equals the hospital's full list price. Many hospitals still reduce bills for uninsured patients: ask the billing office for its self-pay discount in writing. More
Outpatient: lowest $5.00, median $8.44, highest $131.87 — a 26.4× difference within the same market.
As an inpatient, the same code is billed by 7 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 9 of 13 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 magnesium test is, what the price covers and why prices differ: Magnesium test explained.