Ammonia test cost in Houston, TX
In Houston-Pasadena-The Woodlands, TX, 63 hospitals list a cash price for ammonia blood test: from $14.28 to $3,176.26, with a median of $129.50. The lowest listed price is at Hsa St. Joseph — $115.22 less than the median here. Across Texas, the median is $145.94 at 307 hospitals.
Cash prices at 63 facilities across 25 cities for code 82140, as an outpatient — the setting a self-pay patient normally buys. Collected Sep 29, 2026; the hospital files themselves were last updated between Feb 28, 2026 and Sep 8, 2026.
Lowest$14.28Hsa St. Joseph
Median$129.50half of hospitals charge less
Highest$3,176.26in this market
Difference222.4×highest vs lowest
Where each hospital's price falls
Each dot is one hospital's cash price on a scale from the lowest to the highest in Houston-Pasadena-The Woodlands, TX.
median
Lowest $14.28Highest $3,176.26
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list |
|---|---|---|---|---|
| Hsa St. Joseph lowest Houston, TX · (713) 757-1000 RL AMMONIA+1 more line at this price File of Sep 1, 2026 · source file | $14.28 | $259.89 | $7.66–$259.89 | 95% |
| Harris Health Houston, TX · (713) 873-2000 BLOOD AMMONIA+1 more line at this price source file | $14.57 | $136.00 | $7.00–$88.40 | 89% |
| Harris Health Taub Loop Houston, TX · (713) 873-2000 BLOOD AMMONIA+1 more line at this price source file | $14.57 | $136.00 | $7.00–$88.40 | 89% |
| Memorial Hermann Pearland Hospital Pearland, TX · (713) 448-6796 HC ASSAY OF AMMONIA - AMMONIA File of Apr 1, 2026 · source file | $30.16 | $94.25 | — | 68% |
| Memorial Hermann Rehabilitation Hospital Katy Katy, TX HC ASSAY OF AMMONIA - AMMONIA File of Apr 1, 2026 · source file | $30.16 | $94.25 | — | 68% |
| Memorial Hermann Greater Heights Hospital Houston, TX · (713) 448-6796 HC ASSAY OF AMMONIA - AMMONIA File of Apr 1, 2026 · source file | $30.16 | $94.25 | — | 68% |
| Memorial Hermann The Woodlands Medical Center The Woodlands, TX · (713) 448-6796 HC ASSAY OF AMMONIA - AMMONIA File of Apr 1, 2026 · source file | $30.16 | $94.25 | — | 68% |
| Tirr Memorial Hermann Houston, TX HC ASSAY OF AMMONIA - AMMONIA File of Apr 1, 2026 · source file | $30.16 | $94.25 | — | 68% |
| Memorial Hermann Sugar Land Hospital Sugar Land, TX · (281) 725-5000 HC ASSAY OF AMMONIA - AMMONIA File of Apr 1, 2026 · source file | $30.16 | $94.25 | — | 68% |
| Memorial Hermann Southwest Hospital Houston, TX · (713) 448-6796 HC ASSAY OF AMMONIA - AMMONIA File of Apr 1, 2026 · source file | $30.16 | $94.25 | — | 68% |
| Memorial Hermann Southeast Hospital Houston, TX · (713) 448-6796 HC ASSAY OF AMMONIA - AMMONIA File of Apr 1, 2026 · source file | $30.16 | $94.25 | — | 68% |
| Memorial Hermann Katy Hospital Katy, TX · (281) 392-1111 HC ASSAY OF AMMONIA - AMMONIA File of Apr 1, 2026 · source file | $30.16 | $94.25 | — | 68% |
| Memorial Hermann Northeast Hospital Humble, TX · (281) 540-7700 HC ASSAY OF AMMONIA - AMMONIA File of Apr 1, 2026 · source file | $30.16 | $94.25 | — | 68% |
| Memorial Hermann Memorial City Medical Center Houston, TX · (713) 242-3000 HC ASSAY OF AMMONIA - AMMONIA File of Apr 1, 2026 · source file | $30.16 | $94.25 | — | 68% |
| Memorial Hermann Imaging Center (Cypress) Cypress, TX · (713) 704-3700 HC ASSAY OF AMMONIA - AMMONIA File of Apr 1, 2026 · source file | $36.88 | $115.25 | — | 68% |
| Memorial Hermann Cypress Hospital Cypress, TX · (713) 704-3700 HC ASSAY OF AMMONIA - AMMONIA File of Apr 1, 2026 · source file | $36.88 | $115.25 | — | 68% |
| Memorial Hermann Imaging Center (Texas Medical Center) Houston, TX · (713) 704-3700 HC ASSAY OF AMMONIA - AMMONIA File of Apr 1, 2026 · source file | $36.88 | $115.25 | — | 68% |
| Memorial Hermann-Texas Medical Center Houston, TX · (713) 704-3700 HC ASSAY OF AMMONIA - AMMONIA File of Apr 1, 2026 · source file | $36.88 | $115.25 | — | 68% |
| Memorial Hermann Rockets Orthopedic Hospital Bellaire, TX HC ASSAY OF AMMONIA - AMMONIA File of Apr 1, 2026 · source file | $36.88 | $115.25 | — | 68% |
| Memorial Hermann Imaging Center (Bellaire) Bellaire, TX · (713) 704-3700 HC ASSAY OF AMMONIA - AMMONIA File of Apr 1, 2026 · source file | $36.88 | $115.25 | — | 68% |
| Children's Memorial Hermann Hospital Houston, TX HC ASSAY OF AMMONIA - AMMONIA File of Apr 1, 2026 · source file | $36.88 | $115.25 | — | 68% |
| Memorial Hermann Imaging Center (Upper Kirby) Houston, TX · (713) 704-3700 HC ASSAY OF AMMONIA - AMMONIA File of Apr 1, 2026 · source file | $36.88 | $115.25 | — | 68% |
| Texas Children's Hospital Houston, TX · (832) 824-1000 TC AMMONIA REFERENCE TEST STONE+2 more lines at this price File of Mar 5, 2026 · source file | $53.60 | $80.00 | $14.57–$76.00 | 33% |
| Elite Hospital Kingwood Kingwood, TX · (832) 777-6165 Ammonia source file | $65.85 | $131.70 | $98.78 | 50% |
| Texas Children's Hospital Houston, TX · (832) 824-1000 TC AMMONIA+2 more lines at this price File of Mar 5, 2026 · source file | $99.16 | $148.00 | $14.57–$140.60 | 33% |
| Sweeny Community Hospital Sweeny, TX · (979) 548-3311 Ammonia level File of Sep 8, 2026 · source file | $102.54 | $170.90 | $24.90–$170.90 | 40% |
| Texas Children's Hospital Houston, TX · (832) 824-1000 TC STONE RISK - AMMONIA URINE+2 more lines at this price File of Mar 5, 2026 · source file | $105.86 | $158.00 | $14.57–$150.10 | 33% |
| Shriners Childrens Texas Galveston, TX · (409) 770-6600 ASSAY OF AMMONIA source file | $109.20 | $109.20 | $12.38–$27.97 | — |
| Liberty Dayton Regional Medical Center Liberty, TX · (936) 336-7316 Ammonia Level+1 more line at this price source file | $115.00 | $164.00 | $98.00–$156.00 | 30% |
| St Luke's Patients Medical Center Pasadena, TX · (281) 487-0700 AMMONIA File of Feb 28, 2026 · source file | $122.50 | $350.00 | $11.63–$262.50 | 65% |
| St Luke's Sugar Land Hospital Sugar Land, TX · (281) 637-7000 HC LAB AMMONIA (NH3) File of Feb 28, 2026 · source file | $129.50 | $370.00 | $10.49–$370.00 | 65% |
| CHI St. Luke's Health Springwood Village Spring, TX · (936) 266-4050 HC LAB AMMONIA (NH3) File of Feb 28, 2026 · source file | $129.50 | $370.00 | $10.49–$370.00 | 65% |
| CHI St. Luke's Health Baylor College of Medicine Medical Center Houston, TX · (832) 355-1000 HC LAB AMMONIA (NH3) File of Feb 28, 2026 · source file | $129.50 | $370.00 | $10.49–$370.00 | 65% |
| St Luke's the Woodlands Hospital The Woodlands, TX · (936) 266-4050 HC LAB AMMONIA (NH3) File of Feb 28, 2026 · source file | $129.50 | $370.00 | $10.49–$370.00 | 65% |
| St. Lukes Hospital at the Vintage Houston, TX · (832) 534-5000 HC LAB AMMONIA (NH3) File of Feb 28, 2026 · source file | $129.50 | $370.00 | $10.49–$370.00 | 65% |
| St Luke's Lakeside Hospital The Woodlands, TX · (936) 266-4055 HC LAB AMMONIA (NH3) File of Feb 28, 2026 · source file | $129.50 | $370.00 | $10.49–$370.00 | 65% |
| The Community Hospital of Brazosport Lake Jackson, TX · (979) 297-4411 AMMONIA File of Feb 28, 2026 · source file | $133.41 | $381.15 | $12.24–$306.45 | 65% |
| Voyages Behavioral Health of Conroe West Conroe, TX Ammonia File of Aug 6, 2026 · source file | $145.70 | $145.70 | $36.43–$109.28 | — |
| Voyages of Sugar Land South Sugar Land, TX Ammonia File of Aug 6, 2026 · source file | $145.70 | $145.70 | $36.43–$109.28 | — |
| PAM Health Rehabilitation Hospital of Sugar Land Sugar Land, TX Ammonia File of Aug 6, 2026 · source file | $148.00 | $148.00 | $10.93–$125.80 | — |
| Pam Rehabilitation Hospital of Clear Lake Webster, TX Ammonia File of Aug 6, 2026 · source file | $170.55 | $170.55 | $10.93–$153.50 | — |
| PAM Health Rehabilitation Hospital of Houston Heights Houston, TX Ammonia File of Aug 6, 2026 · source file | $218.93 | $218.93 | — | — |
| The Methodist Hospital Houston, TX · (713) 790-2221 HC AMMONIA File of Apr 1, 2026 · source file | $234.50 | $469.00 | — | 50% |
| Houston Methodist Baytown Hospital Baytown, TX · (281) 420-8600 HC AMMONIA File of Apr 1, 2026 · source file | $314.50 | $629.00 | — | 50% |
| Houston Methodist The Woodlands Hospital The Woodlands, TX · (936) 270-2000 HC AMMONIA File of Apr 1, 2026 · source file | $314.50 | $629.00 | — | 50% |
| Methodist Sugar Land Hospital Sugar Land, TX · (281) 274-8000 HC AMMONIA File of Apr 1, 2026 · source file | $314.50 | $629.00 | — | 50% |
| Houston Methodist Cypress Hospital Cypress, TX · (346) 618-1506 HC AMMONIA File of Apr 1, 2026 · source file | $314.50 | $629.00 | — | 50% |
| Methodist Willowbrook Hospital Houston, TX · (281) 477-1000 HC AMMONIA File of Apr 1, 2026 · source file | $314.50 | $629.00 | — | 50% |
| Houston Methodist Clear Lake Hospital Nassau Bay, TX · (281) 333-5503 HC AMMONIA File of Apr 1, 2026 · source file | $314.50 | $629.00 | — | 50% |
| Methodist West Houston Hospital Houston, TX · (832) 522-1000 HC AMMONIA File of Apr 1, 2026 · source file | $314.50 | $629.00 | — | 50% |
| Houston Methodist Continuing Care Hospital Katy, TX HC AMMONIA File of Apr 1, 2026 · source file | $314.50 | $629.00 | — | 50% |
| HCA Houston Healthcare Tomball Houston, TX · (281) 351-7500 AMMONIA+1 more line at this price File of Sep 1, 2026 · source file | $513.37 | $513.37 | $30.80–$436.36 | — |
| HCA Houston Healthcare Medical Center Houston, TX · (713) 527-5019 AMMONIA+1 more line at this price File of Sep 1, 2026 · source file | $597.00 | $597.00 | $35.82–$507.45 | — |
| HCA Houston Healthcare North Cypress Houston, TX · (281) 359-7500 AMMONIA+1 more line at this price File of Sep 1, 2026 · source file | $619.84 | $619.84 | $12.48–$526.86 | — |
| HCA Houston Healthcare Kingwood Cleveland, TX · (281) 359-7500 AMMONIA+1 more line at this price File of Sep 1, 2026 · source file | $619.84 | $619.84 | $12.48–$557.86 | — |
| HCA Houston Healthcare West Houston, TX · (281) 588-8080 AMMONIA+1 more line at this price File of Sep 1, 2026 · source file | $955.00 | $955.00 | $12.48–$859.50 | — |
| The Womans Hospital of Texas Houston, TX · (713) 790-1234 Ammonia +1 more line at this price File of Sep 1, 2026 · source file | $1,164.37 | $1,164.37 | $12.48–$989.71 | — |
| Texas Orthopedic Hospital Houston, TX · (713) 799-8600 Ammonia +1 more line at this price File of Sep 1, 2026 · source file | $1,180.86 | $1,180.86 | $59.93–$1,062.77 | — |
| HCA Houston Healthcare Conroe Conroe, TX · (936) 539-1111 AMMONIA+1 more line at this price File of Sep 1, 2026 · source file | $1,197.84 | $1,197.84 | $59.93–$1,078.06 | — |
| HCA Houston Healthcare Southeast Pasadena, TX · (713) 359-1000 AMMONIA File of Sep 1, 2026 · source file | $1,199.83 | $1,199.83 | $71.99–$1,079.85 | — |
| HCA Houston Rehabilitation Hospital Southeast Pasadena, TX AMMONIA File of Sep 1, 2026 · source file | $1,199.83 | $1,199.83 | $71.99–$1,079.85 | — |
| HCA Houston Healthcare Pearland Houston, TX · (713) 770-7000 AMMONIA+1 more line at this price File of Sep 1, 2026 · source file | $1,268.45 | $1,268.45 | $12.48–$1,078.18 | — |
| HCA Houston Mainland Texas City, TX · (281) 332-2511 AMMONIA+1 more line at this price File of Sep 1, 2026 · source file | $1,456.87 | $1,456.87 | $12.48–$1,311.18 | — |
| HCA Houston Healthcare Clear Lake Friendswood, TX · (281) 332-2511 AMMONIA File of Sep 1, 2026 · source file | $1,456.87 | $1,456.87 | $509.90 | — |
| HCA Houston Healthcare Northwest Spring, TX · (281) 440-1000 AMMONIA+1 more line at this price File of Sep 1, 2026 · source file | $3,176.26 | $3,176.26 | $12.48–$2,699.82 | — |
Hospital The hospital that published the price, its city and the line exactly as written in its price file.
Cash price The hospital's own price for a patient paying without insurance (“discounted cash” in its price file). Hospitals must publish it under federal law, 45 CFR 180.50. Call to confirm it before booking. More
List price The hospital's full chargemaster price (“gross charge”) before any discount. Almost nobody pays it; the gap to the cash price shows what the self-pay discount is worth. More
Insurers pay The lowest and highest rates this hospital has agreed with insurance plans for the same item, from its price file. If the cash price is below what your plan pays and you have not met your deductible, paying cash can cost you less. More
Off list How much lower the cash price is than the list price.
No cash discount This line's cash price equals the hospital's full list price. Many hospitals still reduce bills for uninsured patients: ask the billing office for its self-pay discount in writing. More
Outpatient: lowest $14.28, median $129.50, highest $3,176.26 — a 222.4× difference within the same market.
As an inpatient, the same code is billed by 45 facilities here, median $65.85. 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 15 of 34 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.