Ammonia test cost in Santa Rosa, CA — inpatient
In Santa Rosa-Petaluma, CA, 5 hospitals list a cash price for ammonia blood test as an inpatient: from $17.85 to $411.00, with a median of $118.83. The lowest listed price is at Providence Santa Rosa Memorial Hospital and 1 other hospital — $100.98 less than the median here. Across California, the median is $180.96 at 203 hospitals.
Cash prices at 5 facilities across 3 cities for code 82140, as an inpatient (admitted to hospital) . Collected Sep 29, 2026; the hospital files themselves were last updated between Apr 1, 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 Santa Rosa-Petaluma, CA.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list |
|---|---|---|---|---|
| Providence Santa Rosa Memorial Hospital lowest Santa Rosa, CA · (707) 525-5300 HC ASSAY OF AMMONIA CDM File of Apr 1, 2026 · source file | $17.85 | $35.00 | — | 49% |
| Petaluma Valley Hospital lowest Petaluma, CA · (707) 778-1111 HC ASSAY OF AMMONIA CDM File of Apr 1, 2026 · source file | $17.85 | $35.00 | — | 49% |
| Healdsburg Hospital Healdsburg, CA · (707) 431-6500 HC ASSAY OF AMMONIA LAB File of Apr 1, 2026 · source file | $118.83 | $233.00 | — | 49% |
| Kaiser Foundation Hospital - Santa Rosa Santa Rosa, CA · (707) 571-4000 ASSAY OF AMMONIA File of Apr 1, 2026 · source file | $222.88 | $398.00 | $13.00–$40.00 | 44% |
| Providence Santa Rosa Memorial Hospital Santa Rosa, CA · (707) 525-5300 HC ASSAY OF AMMONIA LAB File of Apr 1, 2026 · source file | $362.10 | $710.00 | — | 49% |
| Sutter Santa Rosa Regional Hospital Santa Rosa, CA · (707) 576-4000 HCHG AMMONIA File of Apr 1, 2026 · source file | $411.00 | $411.00 | — | — |
| Petaluma Valley Hospital Petaluma, CA · (707) 778-1111 HC ASSAY OF AMMONIA LAB File of Apr 1, 2026 · source file | $507.45 | $995.00 | — | 49% |
Inpatient: lowest $17.85, median $118.83, highest $411.00 — a 23.0× difference within the same market.
As an outpatient, the same code is billed by 6 facilities here, median $170.86 — 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 not 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.