Ammonia test cost in Napa, CA — inpatient
In Napa, CA, 1 hospital lists a cash price for ammonia blood test as an inpatient: from $17.85 to $17.85, with a median of $17.85. Across California, the median is $180.96 at 203 hospitals.
Cash prices at 1 facility for code 82140, as an inpatient (admitted to hospital) . Collected Sep 23, 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 Napa, CA.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list |
|---|---|---|---|---|
| Providence Queen of the Valley Medical Center lowest Napa, CA · (707) 252-4411 HC ASSAY OF AMMONIA CDM File of Apr 1, 2026 · source file | $17.85 | $35.00 | — | 49% |
| Providence Queen of the Valley Medical Center Napa, CA · (707) 252-4411 HC ASSAY OF AMMONIA LAB File of Apr 1, 2026 · source file | $486.03 | $953.00 | — | 49% |
Inpatient: lowest $17.85, median $17.85, highest $17.85.
As an outpatient, the same code is billed by 1 facility here, median $17.85 — that is the price to compare if you are not being admitted.
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.