Potassium test cost in St. Louis, MO — inpatient
In St. Louis, MO-IL, 10 hospitals list a cash price for potassium blood test as an inpatient: from $5.28 to $79.20, with a median of $59.17. The lowest listed price is at Ranken Jordan Pediatric Bridge Hospital — $53.89 less than the median here. Across Missouri, the median is $40.00 at 63 hospitals.
Cash prices at 10 facilities across 10 cities for code 84132, 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 Potassium Level File of Apr 24, 2026 · source file | $5.28 | $6.60 | — | 20% |
| St Elizabeths Hospital of the Hospital Sisters of the Third Order of St Francis O'Fallon, IL · (618) 234-2120 HC POTASSIUM File of Mar 24, 2026 · source file | $25.92 | $36.00 | $3.80–$36.00 | 28% |
| Gateway Regional Medical Center Granite City, IL · (618) 798-3000 POTASSIUM SER PL WB File of Mar 30, 2026 · source file | $28.29 | $47.15 | $47.15 | 40% |
| Anderson Hospital Maryville, IL · (618) 288-5711 POTASSIUM LEVEL File of Feb 6, 2026 · source file | $49.90 | $99.80 | $74.85–$89.82 | 50% |
| Community Hospital of Staunton Staunton, IL · (618) 635-2200 POTASSIUM LEVEL File of Feb 9, 2026 · source file | $55.70 | $111.40 | $94.69–$101.37 | 50% |
| Hshs Holy Family Hospital Greenville, IL · (618) 664-1230 HC POTASSIUM File of Mar 24, 2026 · source file | $62.64 | $87.00 | $3.99–$87.00 | 28% |
| Jersey Community Hospital Jerseyville, IL · (618) 498-6402 Potassium Level File of Mar 10, 2026 · source file | $63.00 | $63.00 | $32.95–$53.55 | — |
| St Josephs Hospital Hospital Sisters Third Order of St Francis Breese, IL · (618) 526-4511 HC POTASSIUM File of Mar 24, 2026 · source file | $72.00 | $100.00 | $3.80–$100.00 | 28% |
| Carlinville Area Hospital Carlinville, IL · (217) 854-3141 POTASSIUM File of Mar 21, 2026 · source file | $72.10 | $103.00 | $64.07–$3,396.04 | 30% |
| St Josephs Hospital of the Hospital Sisters of the Third Order of St Francis Highland, IL · (618) 651-2600 HC POTASSIUM File of Mar 24, 2026 · source file | $79.20 | $110.00 | $8.84–$110.00 | 28% |
Inpatient: lowest $5.28, median $59.17, highest $79.20 — a 15.0× difference within the same market.
As an outpatient, the same code is billed by 17 facilities here, median $44.85 — 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 potassium test measures the level of potassium in the blood. Doctors check it for people on diuretics or blood pressure drugs, with kidney disease, an irregular heartbeat, or vomiting and diarrhea.
What the price covers
The price usually covers running the test. The blood draw (36415) is often billed as a separate line.