Ammonia test cost in Eureka, CA — inpatient
In Eureka-Arcata, CA, 4 hospitals list a cash price for ammonia blood test as an inpatient: from $17.85 to $217.90, with a median of $44.93. The lowest listed price is at Providence St Joseph Hospital and 1 other hospital — $27.08 less than the median here. Across California, the median is $180.96 at 207 hospitals.
Cash prices at 4 facilities across 4 cities for code 82140, as an inpatient (admitted to hospital) . Collected Sep 27, 2026; the hospital files themselves were last updated between Jul 22, 2025 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 Eureka-Arcata, CA.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list | File date |
|---|---|---|---|---|---|
| Providence St Joseph Hospital lowest Eureka, CA · (707) 445-8121 HC ASSAY OF AMMONIA CDM | $17.85 | $35.00 | — | 49% | Apr 1, 2026 source file |
| Providence Redwood Memorial Hospital lowest Fortuna, CA · (707) 445-8121 HC ASSAY OF AMMONIA CDM | $17.85 | $35.00 | — | 49% | Apr 1, 2026 source file |
| Mad River Community Hospital Arcata, CA · (707) 822-3621 **82140** | $72.00 | $72.00 | — | — | Jul 22, 2025 source file |
| Mad River Community Hospital Arcata, CA · (707) 822-3621 24HR AMMONIA | $96.32 | $96.32 | — | — | Jul 22, 2025 source file |
| Providence St Joseph Hospital Eureka, CA · (707) 445-8121 HC ASSAY OF AMMONIA LAB | $213.69 | $419.00 | — | 49% | Apr 1, 2026 source file |
| Jerold Phelps Community Hospital Garberville, CA · (707) 923-3921 HC ASSAY OF AMMONIA - AMMONIA | $217.90 | $272.38 | $217.90–$272.38 | 20% | — source file |
| Providence Redwood Memorial Hospital Fortuna, CA · (707) 445-8121 HC ASSAY OF AMMONIA LAB | $219.81 | $431.00 | — | 49% | Apr 1, 2026 source file |
| Mad River Community Hospital Arcata, CA · (707) 822-3621 AMMONIA | $436.37 | $436.37 | — | — | Jul 22, 2025 source file |
Inpatient: lowest $17.85, median $44.93, highest $217.90 — a 12.2× difference within the same market.
As an outpatient, the same code is billed by 4 facilities here, median $54.90 — that is the price to compare if you are not being admitted.
Cash or insurance?
At the one hospital here that publishes insurer rates for this code, the cash price is below the highest rate a health plan has negotiated. 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.