Phosphorus test cost in St. Louis, MO — inpatient
In St. Louis, MO-IL, 10 hospitals list a cash price for phosphorus (phosphate) blood test as an inpatient: from $5.28 to $95.04, with a median of $78.16. The lowest listed price is at Ranken Jordan Pediatric Bridge Hospital — $72.88 less than the median here. Across Missouri, the median is $37.20 at 63 hospitals.
Cash prices at 10 facilities across 10 cities for code 84100, as an inpatient (admitted to hospital) . Collected Sep 27, 2026; the hospital files themselves were last updated between Feb 6, 2026 and Apr 24, 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 St. Louis, MO-IL.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list |
|---|---|---|---|---|
| Ranken Jordan Pediatric Bridge Hospital lowest Maryland Heights, MO · (314) 872-6400 Phosphorus Level File of Apr 24, 2026 · source file | $5.28 | $6.60 | — | 20% |
| Gateway Regional Medical Center Granite City, IL · (618) 798-3000 PHOSPHORUS, BLOOD source file | $28.12 | $46.87 | $46.87 | 40% |
| Community Hospital of Staunton Staunton, IL · (618) 635-2200 PHOSPHORUS LEVEL File of Feb 9, 2026 · source file | $55.70 | $111.40 | $94.69–$101.37 | 50% |
| Jersey Community Hospital Jerseyville, IL · (618) 498-6402 Phosphorus Level source file | $56.00 | $56.00 | $29.29–$47.60 | — |
| St Elizabeths Hospital of the Hospital Sisters of the Third Order of St Francis O'Fallon, IL · (618) 234-2120 HC PHOSPHORUS source file | $77.76 | $108.00 | $3.80–$108.00 | 28% |
| Anderson Hospital Maryville, IL · (618) 288-5711 PHOSPHORUS LEVEL File of Feb 6, 2026 · source file | $78.55 | $157.10 | $117.82–$141.39 | 50% |
| St Josephs Hospital Hospital Sisters Third Order of St Francis Breese, IL · (618) 526-4511 ASSAY OF PHOSPHORUS source file | $86.40 | $120.00 | $3.80–$120.00 | 28% |
| Carlinville Area Hospital Carlinville, IL · (217) 854-3141 PHOSPHORUS source file | $91.70 | $131.00 | $81.48–$3,396.04 | 30% |
| St Josephs Hospital of the Hospital Sisters of the Third Order of St Francis Highland, IL · (618) 651-2600 ASSAY OF PHOSPHORUS source file | $92.16 | $128.00 | $8.84–$128.00 | 28% |
| Hshs Holy Family Hospital Greenville, IL · (618) 664-1230 ASSAY OF PHOSPHORUS source file | $95.04 | $132.00 | $3.99–$132.00 | 28% |
Inpatient: lowest $5.28, median $78.16, highest $95.04 — a 18.0× difference within the same market.
As an outpatient, the same code is billed by 17 facilities here, median $50.70 — that is the price to compare if you are not being admitted.
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 3 it is 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 phosphorus test measures phosphate in the blood. It is used with calcium for kidney disease, bone disease and parathyroid problems.
What the price covers
The price usually covers running the test. The blood draw (36415) is often billed as a separate line.