Phosphorus test cost in Austin, TX
In Austin-Round Rock-San Marcos, TX, 27 hospitals list a cash price for phosphorus (phosphate) blood test: from $5.21 to $513.00, with a median of $50.56. The lowest listed price is at The Hospital at Westlake Medical Center — $45.35 less than the median here. Across Texas, the median is $62.59 at 274 hospitals.
Cash prices at 27 facilities across 12 cities for code 84100, as an outpatient — the setting a self-pay patient normally buys. Collected Sep 29, 2026; the hospital files themselves were last updated between Mar 5, 2026 and Sep 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 Austin-Round Rock-San Marcos, TX.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list |
|---|---|---|---|---|
| The Hospital at Westlake Medical Center lowest Austin, TX · (512) 327-0000 PHOSPHORUS+1 more line at this price source file | $5.21 | $34.65 | $3.98–$24.26 | 85% |
| Ascension Seton Hays Kyle, TX · (512) 324-5000 PHOSPHORUS (PHOSPHATE) BLOOD+3 more lines at this price source file | $20.61 | $57.25 | $3.98–$35.21 | 64% |
| Ascension Seton Northwest Austin, TX · (512) 324-6000 PHOSPHORUS FLUID+3 more lines at this price source file | $21.42 | $59.50 | $3.98–$35.21 | 64% |
| Ascension Seton Smithville Smithville, TX · (512) 237-3214 PHOSPHORUS (PHOSPHATE) BLOOD+3 more lines at this price source file | $21.42 | $59.50 | $3.98–$35.21 | 64% |
| Ascension Seton Medical Center Austin Austin, TX · (512) 324-1000 PHOSPHORUS FLUID+3 more lines at this price source file | $21.42 | $59.50 | $3.98–$35.21 | 64% |
| Ascension Seton Southwest Austin, TX · (512) 324-9000 PHOSPHORUS FLUID+3 more lines at this price source file | $21.42 | $59.50 | $3.98–$35.21 | 64% |
| Ascension Seton Hays Kyle, TX · (512) 324-5000 PHOSPHORUS FLUID+1 more line at this price source file | $21.42 | $59.50 | $3.98–$35.21 | 64% |
| Dell Seton Medical Center at the University of Tx Austin, TX · (512) 324-7000 PHOSPHORUS FLUID+3 more lines at this price source file | $21.42 | $59.50 | $3.98–$35.21 | 64% |
| Ascension Seton Edgar B Davis Luling, TX · (830) 875-7000 PHOSPHORUS+3 more lines at this price source file | $27.09 | $75.25 | $3.98–$35.21 | 64% |
| Ascension Seton Smithville Smithville, TX · (512) 237-3214 PHOSPHORUS FLUID+1 more line at this price source file | $40.14 | $111.50 | $3.98–$50.17 | 64% |
| Ascension Seton Austin, TX PHOSPHORUS+3 more lines at this price source file | $41.65 | $59.50 | $3.98–$35.21 | 30% |
| Baylor Scott & White Emergency Medical Center - Cedar Park Cedar Park, TX · (512) 509-0401 HC PHOSPHORUS INORGANIC (PHOSPHATE) File of Jun 3, 2026 · source file | $50.56 | $84.27 | $4.98–$54.78 | 40% |
| Baylor Scott & White Medical Center - Round Rock Round Rock, TX · (512) 509-0401 HC PHOSPHORUS INORGANIC (PHOSPHATE) File of Jun 13, 2026 · source file | $50.56 | $84.27 | $3.98–$75.84 | 40% |
| Baylor Scott & White Medical Center - Lakeway Lakeway, TX · (512) 509-0401 HC PHOSPHORUS INORGANIC (PHOSPHATE) File of Jun 13, 2026 · source file | $50.56 | $84.27 | $3.98–$75.84 | 40% |
| Baylor Scott & White Medical Center - Pflugerville Pflugerville, TX · (512) 654-6100 HC PHOSPHORUS INORGANIC (PHOSPHATE) File of Jun 13, 2026 · source file | $50.56 | $84.27 | $3.98–$75.84 | 40% |
| Baylor Scott & White Medical Center - Buda Buda, TX · (737) 999-6200 HC PHOSPHORUS INORGANIC (PHOSPHATE) File of Jun 13, 2026 · source file | $50.56 | $84.27 | $3.98–$63.20 | 40% |
| Baylor Scott & White Medical Center - Austin Austin, TX · (512) 654-2100 HC PHOSPHORUS INORGANIC (PHOSPHATE) File of Jun 13, 2026 · source file | $50.56 | $84.27 | $3.98–$63.20 | 40% |
| Baylor Scott & White Medical Center - Taylor Taylor, TX · (512) 352-7611 HC PHOSPHORUS INORGANIC (PHOSPHATE) File of Jun 12, 2026 · source file | $50.56 | $84.27 | $6.94–$67.42 | 40% |
| Texas Children's Hospital - Austin Austin, TX · (832) 824-1100 TC PHOSPHORUS, INORGANIC File of Mar 5, 2026 · source file | $62.31 | $93.00 | $4.74–$88.35 | 33% |
| Ascension Seton Austin, TX PHOSPHORUS FLUID+1 more line at this price source file | $78.05 | $111.50 | $3.98–$50.17 | 30% |
| Ascension Cedar Park Cedar Park, TX · (512) 528-7000 PHOSPHORUS, BLOOD+1 more line at this price source file | $90.41 | $251.13 | $3.98–$113.01 | 64% |
| Pam Specialty Hospital of Luling Luling, TX Phosphorus File of Aug 6, 2026 · source file | $98.75 | $98.75 | $3.56–$88.88 | — |
| St. David's Georgetown Hospital Georgetown, TX · (512) 476-7111 PHOSPHORUS BLD File of Sep 1, 2026 · source file | $237.00 | $237.00 | $165.66 | — |
| Heart Hosp of Austin at St. David's Round Rock Round Rock, TX PHOSPHORUS BLD File of Sep 1, 2026 · source file | $237.00 | $237.00 | $165.66 | — |
| St. David's South Austin Medical Center Bastrop, TX · (512) 448-7107 PHOSPHORUS BLD File of Sep 1, 2026 · source file | $363.00 | $363.00 | $177.87 | — |
| St.davids Surgical Hospital Austin, TX Phosphorus inorganic (phosphate); +1 more line at this price File of Sep 1, 2026 · source file | $462.00 | $462.00 | $4.74–$392.70 | — |
| St. David's North Austin Medical Center Austin, TX · (512) 901-1000 PHOSPHORUS BLD File of Sep 1, 2026 · source file | $462.00 | $462.00 | $23.10–$415.80 | — |
| St. David's Round Rock Medical Center Pflugerville, TX · (512) 341-1000 PHOSPHORUS BLD File of Sep 1, 2026 · source file | $473.00 | $473.00 | $23.65–$425.70 | — |
| Heart Hosp of Austin Austin, TX PHOSPHORUS BLD File of Sep 1, 2026 · source file | $513.00 | $513.00 | $345.76 | — |
| St. David's Medical Center Austin, TX · (512) 476-7111 PHOSPHORUS BLD File of Sep 1, 2026 · source file | $513.00 | $513.00 | $358.59 | — |
Outpatient: lowest $5.21, median $50.56, highest $513.00 — a 98.5× difference within the same market.
As an inpatient, the same code is billed by 18 facilities here, median $50.56. 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 17 of 27 hospitals that publish insurer rates for this code here, the cash price is below the highest rate a health plan has negotiated, and at none is it 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
A phosphorus test measures phosphate in the blood. It is used with calcium for kidney disease, bone disease and parathyroid problems.
What the price covers
The price usually covers running the test. The blood draw (36415) is often billed as a separate line.