Potassium test cost in Seattle, WA
In Seattle-Tacoma-Bellevue, WA, 18 hospitals list a cash price for potassium blood test: from $10.50 to $53.60, with a median of $32.57. The lowest listed price is at Overlake Medical Center & Clinics — $22.07 less than the median here. Across Washington, the median is $40.70 at 58 hospitals.
Cash prices at 18 facilities across 14 cities for code 84132, as an outpatient — the setting a self-pay patient normally buys. Collected Sep 27, 2026; the hospital files themselves were last updated between Feb 28, 2026 and Apr 1, 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 Seattle-Tacoma-Bellevue, WA.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list |
|---|---|---|---|---|
| Overlake Medical Center & Clinics lowest Bellevue, WA · (425) 688-5000 Hc Istat Potassium File of Apr 1, 2026 · source file | $10.50 | $21.00 | — | 50% |
| Overlake Medical Center & Clinics Bellevue, WA · (425) 688-5000 Hc Potassium Resp Care File of Apr 1, 2026 · source file | $18.50 | $37.00 | — | 50% |
| Overlake Medical Center & Clinics Bellevue, WA · (425) 688-5000 Hc Assay Of Serum Potassium File of Apr 1, 2026 · source file | $19.50 | $39.00 | — | 50% |
| Snoqualmie Valley Hospital Snoqualmie, WA · (425) 831-2300 Facility Fee HC POTASSIUM-LC+1 more line at this price source file | $24.38 | $42.03 | $4.66–$38.67 | 42% |
| Saint Clare Hospital Lakewood, WA · (253) 588-1711 HC POTASSIUM ASSAY SERUM POC File of Feb 28, 2026 · source file | $28.28 | $98.10 | $4.76–$73.58 | 71% |
| Virginia Mason Medical Center Seattle, WA · (206) 223-6600 POTASSIUM BLOOD source file | $29.58 | $58.00 | $34.80–$46.40 | 49% |
| Saint Clare Hospital Lakewood, WA · (253) 588-1711 HC POTASSIUM I-STAT File of Feb 28, 2026 · source file | $29.70 | $103.01 | $4.76–$77.26 | 71% |
| St Anthony Hospital Gig Harbor, WA · (253) 530-2050 HC POTASSIUM ASSAY SERUM POC File of Feb 28, 2026 · source file | $29.84 | $98.10 | $4.76–$73.58 | 70% |
| Highline Medical Center Burien, WA · (206) 431-5237 HC POTASSIUM ASSAY SERUM POC File of Feb 28, 2026 · source file | $29.96 | $98.10 | $4.76–$88.29 | 69% |
| St Francis Community Hospital Federal Way, WA · (253) 944-8100 HC POTASSIUM ASSAY SERUM POC File of Feb 28, 2026 · source file | $30.79 | $98.10 | $4.76–$73.58 | 69% |
| St Anthony Hospital Gig Harbor, WA · (253) 530-2050 HC POTASSIUM I-STAT File of Feb 28, 2026 · source file | $31.34 | $103.01 | $4.76–$77.26 | 70% |
| Highline Medical Center Burien, WA · (206) 431-5237 HC POTASSIUM I-STAT File of Feb 28, 2026 · source file | $31.46 | $103.01 | $4.76–$92.71 | 69% |
| Valley Medical Center Renton, WA · (425) 228-3450 Potassium Serum Plasma/Whole Blood source file | $31.50 | $45.00 | — | 30% |
| St Francis Community Hospital Federal Way, WA · (253) 944-8100 HC POTASSIUM I-STAT File of Feb 28, 2026 · source file | $32.33 | $103.01 | $4.76–$77.26 | 69% |
| St Joseph Medical Center Tacoma, WA · (253) 627-4101 HC POTASSIUM ASSAY SERUM POC File of Feb 28, 2026 · source file | $32.50 | $98.10 | $4.76–$73.58 | 67% |
| Swedish Edmonds Edmonds, WA · (425) 640-4000 HC POTASSIUM File of Apr 1, 2026 · source file | $32.64 | $68.00 | — | 52% |
| Swedish Medical Center Seattle, WA · (206) 386-6000 HC POTASSIUM File of Apr 1, 2026 · source file | $32.64 | $68.00 | — | 52% |
| Swedish Medical Center / Cherry Hill Seattle, WA · (206) 320-2000 HC POTASSIUM File of Apr 1, 2026 · source file | $32.64 | $68.00 | — | 52% |
| Swedish Issaquah Issaquah, WA · (425) 313-4000 HC POTASSIUM File of Apr 1, 2026 · source file | $32.64 | $68.00 | — | 52% |
| Swedish Issaquah Issaquah, WA · (425) 313-4000 HC POTASSIUM SERUM PLASMA/WHOLE BLOOD File of Apr 1, 2026 · source file | $33.60 | $70.00 | — | 52% |
| Swedish Medical Center / Cherry Hill Seattle, WA · (206) 320-2000 HC POTASSIUM SERUM PLASMA/WHOLE BLOOD File of Apr 1, 2026 · source file | $33.60 | $70.00 | — | 52% |
| Swedish Edmonds Edmonds, WA · (425) 640-4000 HC POTASSIUM SERUM PLASMA/WHOLE BLOOD File of Apr 1, 2026 · source file | $33.60 | $70.00 | — | 52% |
| Swedish Medical Center Seattle, WA · (206) 386-6000 HC POTASSIUM SERUM PLASMA/WHOLE BLOOD File of Apr 1, 2026 · source file | $33.60 | $70.00 | — | 52% |
| St Joseph Medical Center Tacoma, WA · (253) 627-4101 HC POTASSIUM I-STAT File of Feb 28, 2026 · source file | $34.12 | $103.01 | $4.76–$77.26 | 67% |
| St Elizabeth Hospital Enumclaw, WA · (360) 825-2505 HC POTASSIUM ASSAY SERUM POC File of Feb 28, 2026 · source file | $34.67 | $98.10 | $4.76–$88.29 | 65% |
| Providence Regional Medical Center Everett Everett, WA · (425) 261-2000 HC POTASSIUM SERUM PLASMA/WHOLE BLOOD+1 more line at this price File of Apr 1, 2026 · source file | $35.36 | $68.00 | — | 48% |
| St Elizabeth Hospital Enumclaw, WA · (360) 825-2505 HC POTASSIUM I-STAT File of Feb 28, 2026 · source file | $36.41 | $103.01 | $4.76–$92.71 | 65% |
| Seattle Children's Hospital Seattle, WA · (206) 987-2000 Esrd Assay of Serum Potassium source file | $43.00 | $43.00 | $10.84–$41.28 | — |
| Cascade Valley Hospital Arlington, WA · (360) 435-2133 HC ASSAY OF SERUM POTASSIUM source file | $43.20 | $54.00 | $4.59–$48.60 | 20% |
| Seattle Children's Hospital Seattle, WA · (206) 987-2000 Esrd Potassium source file | $49.40 | $49.40 | $12.45–$47.42 | — |
| Kaiser Permanente Central Hospital Seattle, WA · (206) 326-3000 POTASSIUM SERUM File of Apr 1, 2026 · source file | $53.60 | $67.00 | $4.00–$15.00 | 20% |
| Seattle Children's Hospital Seattle, WA · (206) 987-2000 Potassium, Body Fluid+1 more line at this price source file | $63.80 | $63.80 | $16.08–$61.25 | — |
Outpatient: lowest $10.50, median $32.57, highest $53.60 — a 5.1× difference within the same market.
As an inpatient, the same code is billed by 19 facilities here, median $32.50. 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 9 of 11 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.