Potassium test cost in Milwaukee, WI
In Milwaukee-Waukesha, WI, 17 hospitals list a cash price for potassium blood test: from $16.43 to $53.49, with a median of $27.50. The lowest listed price is at Ascension Columbia St. Mary's Hospital - Ozaukee Campus — $11.07 less than the median here. Across Wisconsin, the median is $29.04 at 97 hospitals.
Cash prices at 17 facilities across 11 cities for code 84132, as an outpatient — the setting a self-pay patient normally buys. Collected Sep 23, 2026; the hospital files themselves were last updated between Nov 21, 2025 and Mar 23, 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 Milwaukee-Waukesha, WI.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list | File date |
|---|---|---|---|---|---|
| Ascension Columbia St. Mary's Hospital - Ozaukee Campus lowest Mequon, WI HC ASSAY OF SERUM POTASSIUM - POC | $16.43 | $31.00 | $5.00–$20.97 | 47% | — source file |
| Ascension Columbia St. Mary's Hospital - Ozaukee Campus lowest Mequon, WI HC ASSAY OF SERUM POTASSIUM - POC | $16.43 | $31.00 | $5.00–$20.97 | 47% | — source file |
| Ascension SE Wisconsin Hospital - Franklin Campus Franklin, WI · (414) 447-2130 HC ASSAY OF SERUM POTASSIUM - POC | $23.32 | $44.00 | $5.00–$21.60 | 47% | — source file |
| Ascension SE Wisconsin Hospital - Franklin Campus Franklin, WI · (414) 447-2130 HC ASSAY OF SERUM POTASSIUM | $23.32 | $44.00 | $5.00–$21.60 | 47% | — source file |
| Midwest Orthopedic Specialty Hospital Franklin, WI HC ASSAY OF SERUM POTASSIUM | $23.32 | $44.00 | $5.00–$21.60 | 47% | — source file |
| Ascension SE Wisconsin Hospital Milwaukee, WI · (414) 447-2130 HC ASSAY OF SERUM POTASSIUM - POC | $23.32 | $44.00 | $5.00–$21.60 | 47% | — source file |
| Ascension St. Francis Hospital Milwaukee, WI · (414) 647-5000 HC ASSAY OF SERUM POTASSIUM - POC | $23.32 | $44.00 | $5.00–$21.60 | 47% | — source file |
| Ascension SE Wisconsin Hospital Milwaukee, WI · (414) 447-2130 HC ASSAY OF SERUM POTASSIUM | $23.32 | $44.00 | $5.00–$21.60 | 47% | — source file |
| Ascension St. Francis Hospital Milwaukee, WI · (414) 647-5000 HC ASSAY OF SERUM POTASSIUM | $23.32 | $44.00 | $5.00–$21.60 | 47% | — source file |
| Midwest Orthopedic Specialty Hospital Franklin, WI HC ASSAY OF SERUM POTASSIUM - POC | $23.32 | $44.00 | $5.00–$21.60 | 47% | — source file |
| Orthopaedic Hospital of Wisconsin Glendale, WI POTASSIUM BLOOD POC | $27.03 | $51.00 | $4.62–$11.23 | 47% | — source file |
| Orthopaedic Hospital of Wisconsin Glendale, WI POTASSIUM BLOOD | $27.03 | $51.00 | $4.62–$11.23 | 47% | — source file |
| Aurora West Allis Medical Center West Allis, WI · (414) 328-6000 POC POTASSIUM SERUM | $27.50 | $55.00 | $3.81–$46.75 | 50% | Nov 21, 2025 source file |
| Aurora Medical Center Summit Summit, WI · (262) 434-1600 POC POTASSIUM SERUM | $27.50 | $55.00 | $3.81–$46.75 | 50% | Nov 21, 2025 source file |
| Aurora St Lukes Medical Center of Aurora Health Care Metro Milwaukee, WI · (414) 649-6000 POC POTASSIUM SERUM | $27.50 | $55.00 | $3.81–$46.75 | 50% | Nov 21, 2025 source file |
| Aurora Medical Center Kenosha Kenosha, WI · (262) 948-5600 POC POTASSIUM SERUM | $27.50 | $55.00 | $3.81–$46.75 | 50% | Nov 21, 2025 source file |
| Aurora St. Luke's South Shore of Aurora Health Care Metro Cudahy, WI · (414) 649-6000 POC POTASSIUM SERUM | $27.50 | $55.00 | $3.81–$46.75 | 50% | Nov 21, 2025 source file |
| Aurora Medical Center Washington County Hartford, WI · (262) 673-2300 POC POTASSIUM SERUM | $27.50 | $55.00 | $3.81–$46.75 | 50% | Nov 21, 2025 source file |
| Aurora Medical Center Grafton Grafton, WI · (262) 329-1000 POC POTASSIUM SERUM | $27.50 | $55.00 | $3.81–$46.75 | 50% | Nov 21, 2025 source file |
| Aurora St Lukes Medical Center Milwaukee, WI · (414) 649-6000 POC POTASSIUM SERUM | $27.50 | $55.00 | $3.81–$46.75 | 50% | Nov 21, 2025 source file |
| Aurora Medical Center Grafton Grafton, WI · (262) 329-1000 POTASSIUM SERUM | $35.00 | $70.00 | $3.81–$59.50 | 50% | Nov 21, 2025 source file |
| Aurora Medical Center Kenosha Kenosha, WI · (262) 948-5600 POTASSIUM SERUM | $35.00 | $70.00 | $3.81–$59.50 | 50% | Nov 21, 2025 source file |
| Aurora St Lukes Medical Center Milwaukee, WI · (414) 649-6000 POTASSIUM SERUM | $35.00 | $70.00 | $3.81–$59.50 | 50% | Nov 21, 2025 source file |
| Aurora Medical Center Washington County Hartford, WI · (262) 673-2300 POTASSIUM SERUM | $35.00 | $70.00 | $3.81–$59.50 | 50% | Nov 21, 2025 source file |
| Aurora St Lukes Medical Center of Aurora Health Care Metro Milwaukee, WI · (414) 649-6000 POTASSIUM SERUM | $35.00 | $70.00 | $3.81–$59.50 | 50% | Nov 21, 2025 source file |
| Aurora Medical Center Summit Summit, WI · (262) 434-1600 POTASSIUM SERUM | $35.00 | $70.00 | $3.81–$59.50 | 50% | Nov 21, 2025 source file |
| Aurora Psychiatric Hospital Wauwatosa, WI · (414) 454-6600 POTASSIUM SERUM | $35.00 | $70.00 | $3.81–$59.50 | 50% | Nov 21, 2025 source file |
| Aurora West Allis Medical Center West Allis, WI · (414) 328-6000 POTASSIUM SERUM | $35.00 | $70.00 | $3.81–$59.50 | 50% | Nov 21, 2025 source file |
| Aurora St. Luke's South Shore of Aurora Health Care Metro Cudahy, WI · (414) 649-6000 POTASSIUM SERUM | $35.00 | $70.00 | $3.81–$59.50 | 50% | Nov 21, 2025 source file |
| Ascension Columbia St. Mary's Hospital - Ozaukee Campus Mequon, WI HC ASSAY OF SERUM POTASSIUM | $37.63 | $71.00 | $5.00–$20.97 | 47% | — source file |
| Ascension Columbia St. Mary's Hospital - Ozaukee Campus Mequon, WI HC ASSAY OF SERUM POTASSIUM | $37.63 | $71.00 | $5.00–$20.97 | 47% | — source file |
| Ascension Columbia St. Mary's Hospital - Milwaukee Campus Milwaukee, WI · (414) 585-1374 HC ASSAY OF SERUM POTASSIUM | $37.63 | $71.00 | $5.00–$20.97 | 47% | — source file |
| Ascension Columbia St. Mary's Hospital - Milwaukee Campus Milwaukee, WI · (414) 585-1374 HC ASSAY OF SERUM POTASSIUM | $37.63 | $71.00 | $5.00–$20.97 | 47% | — source file |
| Children's Hospital of Wisconsin Milwaukee, WI · (414) 266-3954 HBC POTASSIUM BLOOD | $53.49 | $97.25 | $68.08–$92.39 | 45% | Mar 23, 2026 source file |
| Children's Hospital of Wisconsin Milwaukee, WI · (414) 266-3954 HBC SURGERY K BAG BLOOD | $53.49 | $97.25 | $68.08–$92.39 | 45% | Mar 23, 2026 source file |
| Children's Hospital of Wisconsin Milwaukee, WI · (414) 266-3954 HBC POCT POTASSIUM | $53.49 | $97.25 | $68.08–$92.39 | 45% | Mar 23, 2026 source file |
| Children's Hospital of Wisconsin Milwaukee, WI · (414) 266-3954 HBC ISTAT POTASSIUM | $53.49 | $97.25 | $68.08–$92.39 | 45% | Mar 23, 2026 source file |
| Children's Hospital of Wisconsin Milwaukee, WI · (414) 266-3954 HBC POTASSIUM BLOOD APPLTN | $53.49 | $97.25 | $68.08–$92.39 | 45% | Mar 23, 2026 source file |
| Children's Hospital of Wisconsin Milwaukee, WI · (414) 266-3954 HBC POTASSIUM BLOOD | $53.49 | $97.25 | $68.08–$92.39 | 45% | Mar 23, 2026 source file |
| Children's Hospital of Wisconsin Milwaukee, WI · (414) 266-3954 HBC PUMP PRIME POTASSIUM | $53.49 | $97.25 | $68.08–$92.39 | 45% | Mar 23, 2026 source file |
| Children's Hospital of Wisconsin Milwaukee, WI · (414) 266-3954 HBC SURGERY K BAG BLOOD | $53.49 | $97.25 | $68.08–$92.39 | 45% | Mar 23, 2026 source file |
| Children's Hospital of Wisconsin Milwaukee, WI · (414) 266-3954 HBC POCT POTASSIUM | $53.49 | $97.25 | $68.08–$92.39 | 45% | Mar 23, 2026 source file |
| Children's Hospital of Wisconsin Milwaukee, WI · (414) 266-3954 HBC ISTAT POTASSIUM | $53.49 | $97.25 | $68.08–$92.39 | 45% | Mar 23, 2026 source file |
| Children's Hospital of Wisconsin Milwaukee, WI · (414) 266-3954 HBC POTASSIUM BLOOD APPLTN | $53.49 | $97.25 | $68.08–$92.39 | 45% | Mar 23, 2026 source file |
| Children's Hospital of Wisconsin Milwaukee, WI · (414) 266-3954 HBC PUMP PRIME POTASSIUM | $53.49 | $97.25 | $68.08–$92.39 | 45% | Mar 23, 2026 source file |
Outpatient: lowest $16.43, median $27.50, highest $53.49 — a 3.3× difference within the same market.
As an inpatient, the same code is billed by 13 facilities here, median $27.50. 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 11 of 17 hospitals that publish insurer rates for this code here, the cash price is below the highest rate a health plan has negotiated, and at 1 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.