Ammonia test cost in San Antonio, TX — inpatient
In San Antonio-New Braunfels, TX, 6 hospitals list a cash price for ammonia blood test as an inpatient: from $33.00 to $525.45, with a median of $173.40. The lowest listed price is at University Health System — $140.40 less than the median here. Across Texas, the median is $145.94 at 307 hospitals.
Cash prices at 6 facilities across 4 cities for code 82140, as an inpatient (admitted to hospital) . Collected Sep 29, 2026; the hospital files themselves were last updated between Oct 14, 2025 and Aug 6, 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 San Antonio-New Braunfels, TX.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list |
|---|---|---|---|---|
| University Health System lowest San Antonio, TX · (210) 358-2000 HC ASSAY OF AMMONIA - AMMONIA File of Oct 14, 2025 · source file | $33.00 | $132.00 | $48.84–$112.20 | 75% |
| Medina Regional Hospital Hondo, TX · (830) 426-7700 AMMONIA, BLOOD File of Jul 29, 2026 · source file | $78.97 | $87.74 | $43.87–$78.97 | 10% |
| Guadalupe Regional Medical Center Seguin, TX · (830) 379-2411 AMMONIA+1 more line at this price source file | $120.00 | $240.00 | $14.57–$240.00 | 50% |
| Warm Springs Rehabilitation Hospital of San Antonio San Antonio, TX Ammonia File of Aug 6, 2026 · source file | $226.80 | $226.80 | $158.76–$204.12 | — |
| Pam Speciality Hospital of New Braunfels New Braunfels, TX Ammonia File of Aug 6, 2026 · source file | $248.30 | $248.30 | $173.81–$223.47 | — |
| Specialty Hospital of San Antonio Medical Center South San Antonio, TX Ammonia File of Aug 6, 2026 · source file | $525.45 | $525.45 | $367.82–$472.91 | — |
Inpatient: lowest $33.00, median $173.40, highest $525.45 — a 15.9× difference within the same market.
As an outpatient, the same code is billed by 16 facilities here, median $239.82 — that is the price to compare if you are not being admitted.
Cash or insurance?
At 2 of 6 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.