Ammonia test cost in Seattle, WA
In Seattle-Tacoma-Bellevue, WA, 18 hospitals list a cash price for ammonia blood test: from $57.12 to $195.10, with a median of $82.97. The lowest listed price is at Virginia Mason Medical Center — $25.85 less than the median here. Across Washington, the median is $114.40 at 59 hospitals.
Cash prices at 18 facilities across 14 cities for code 82140, 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 | File date |
|---|---|---|---|---|---|
| Virginia Mason Medical Center lowest Seattle, WA · (206) 223-6600 AMMONIA SERUM | $57.12 | $112.00 | $67.20–$89.60 | 49% | — source file |
| Saint Clare Hospital Lakewood, WA · (253) 588-1711 HC AMMONIA-ARTERIAL BLOOD | $63.42 | $219.99 | $14.57–$165.00 | 71% | Feb 28, 2026 source file |
| St Anthony Hospital Gig Harbor, WA · (253) 530-2050 HC AMMONIA-ARTERIAL BLOOD | $66.91 | $219.99 | $14.57–$165.00 | 70% | Feb 28, 2026 source file |
| Highline Medical Center Burien, WA · (206) 431-5237 HC AMMONIA-ARTERIAL BLOOD | $67.18 | $219.99 | $14.57–$198.00 | 69% | Feb 28, 2026 source file |
| St Francis Community Hospital Federal Way, WA · (253) 944-8100 HC AMMONIA-ARTERIAL BLOOD | $69.04 | $219.99 | $14.57–$165.00 | 69% | Feb 28, 2026 source file |
| St Joseph Medical Center Tacoma, WA · (253) 627-4101 HC AMMONIA-ARTERIAL BLOOD | $72.87 | $219.99 | $14.57–$165.00 | 67% | Feb 28, 2026 source file |
| Snoqualmie Valley Hospital Snoqualmie, WA · (425) 831-2300 Facility Fee HC ASSAY OF AMMONIA | $74.63 | $128.67 | $14.28–$118.38 | 42% | — source file |
| Snoqualmie Valley Hospital Snoqualmie, WA · (425) 831-2300 Facility Fee HC AMMONIA, PLASMA-LC | $74.63 | $128.67 | $14.28–$118.38 | 42% | — source file |
| Overlake Medical Center & Clinics Bellevue, WA · (425) 688-5000 Hc Assay Of Ammonia | $75.50 | $151.00 | — | 50% | Apr 1, 2026 source file |
| St Elizabeth Hospital Enumclaw, WA · (360) 825-2505 HC AMMONIA-ARTERIAL BLOOD | $77.74 | $219.99 | $14.57–$198.00 | 65% | Feb 28, 2026 source file |
| Valley Medical Center Renton, WA · (425) 228-3450 Assay of Ammonia | $88.20 | $126.00 | — | 30% | — source file |
| Swedish Medical Center Seattle, WA · (206) 386-6000 HC ASSAY OF AMMONIA LAB | $105.60 | $220.00 | — | 52% | Apr 1, 2026 source file |
| Swedish Medical Center / Cherry Hill Seattle, WA · (206) 320-2000 HC ASSAY OF AMMONIA LAB | $105.60 | $220.00 | — | 52% | Apr 1, 2026 source file |
| Swedish Issaquah Issaquah, WA · (425) 313-4000 HC ASSAY OF AMMONIA LAB | $105.60 | $220.00 | — | 52% | Apr 1, 2026 source file |
| Swedish Edmonds Edmonds, WA · (425) 640-4000 HC ASSAY OF AMMONIA LAB | $105.60 | $220.00 | — | 52% | Apr 1, 2026 source file |
| Providence Regional Medical Center Everett Everett, WA · (425) 261-2000 HC ASSAY OF AMMONIA LAB | $114.40 | $220.00 | — | 48% | Apr 1, 2026 source file |
| Kaiser Permanente Central Hospital Seattle, WA · (206) 326-3000 "LAB, AMMONIA" | $147.20 | $184.00 | $11.00–$40.00 | 20% | Apr 1, 2026 source file |
| Cascade Valley Hospital Arlington, WA · (360) 435-2133 HC AMMONIA | $162.40 | $203.00 | $14.57–$182.70 | 20% | — source file |
| Seattle Children's Hospital Seattle, WA · (206) 987-2000 Ammonia Level 9 Post | $195.10 | $195.10 | $49.17–$187.30 | — | — source file |
| Seattle Children's Hospital Seattle, WA · (206) 987-2000 Ammonia Level 4 Post | $195.10 | $195.10 | $49.17–$187.30 | — | — source file |
| Seattle Children's Hospital Seattle, WA · (206) 987-2000 Ammonia, Body Fluid | $195.10 | $195.10 | $49.17–$187.30 | — | — source file |
| Seattle Children's Hospital Seattle, WA · (206) 987-2000 Ammonia Level 6 Post | $195.10 | $195.10 | $49.17–$187.30 | — | — source file |
| Seattle Children's Hospital Seattle, WA · (206) 987-2000 Ammonia Level 10 Post | $195.10 | $195.10 | $49.17–$187.30 | — | — source file |
| Seattle Children's Hospital Seattle, WA · (206) 987-2000 Ammonia Level 5 Post | $195.10 | $195.10 | $49.17–$187.30 | — | — source file |
| Seattle Children's Hospital Seattle, WA · (206) 987-2000 UR Stone Risk Ammonia | $195.10 | $195.10 | $49.17–$187.30 | — | — source file |
| Seattle Children's Hospital Seattle, WA · (206) 987-2000 Ammonia Level 2 Post | $195.10 | $195.10 | $49.17–$187.30 | — | — source file |
| Seattle Children's Hospital Seattle, WA · (206) 987-2000 Ammonia Level 8 Post | $195.10 | $195.10 | $49.17–$187.30 | — | — source file |
| Seattle Children's Hospital Seattle, WA · (206) 987-2000 Ammonia Level 1 Post | $195.10 | $195.10 | $49.17–$187.30 | — | — source file |
| Seattle Children's Hospital Seattle, WA · (206) 987-2000 Ammonia Level 3 Post | $195.10 | $195.10 | $49.17–$187.30 | — | — source file |
| Seattle Children's Hospital Seattle, WA · (206) 987-2000 Ammonia Level 7 Post | $195.10 | $195.10 | $49.17–$187.30 | — | — source file |
| Seattle Children's Hospital Seattle, WA · (206) 987-2000 Ammonia, Arterial | $196.50 | $196.50 | $49.52–$188.64 | — | — source file |
| Seattle Children's Hospital Seattle, WA · (206) 987-2000 Ammonia, Venous | $204.00 | $204.00 | $51.41–$195.84 | — | — source file |
Outpatient: lowest $57.12, median $82.97, highest $195.10 — a 3.4× difference within the same market.
As an inpatient, the same code is billed by 19 facilities here, median $77.74. 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
An ammonia test measures ammonia in the blood. It is used for confusion or drowsiness in people with liver disease and for some rare inherited disorders in newborns.
What the price covers
The price usually covers running the test. The blood draw (36415) is often billed as a separate line.