Phosphorus test cost in San Jose, CA
In San Jose-Sunnyvale-Santa Clara, CA, 6 hospitals list a cash price for phosphorus (phosphate) blood test: from $7.61 to $103.25, with a median of $75.60. The lowest listed price is at Stanford Health Care — $67.99 less than the median here. Across California, the median is $75.60 at 198 hospitals.
Cash prices at 6 facilities across 6 cities for code 84100, as an outpatient — the setting a self-pay patient normally buys. Collected Sep 27, 2026; the hospital files themselves were last updated between Mar 31, 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 San Jose-Sunnyvale-Santa Clara, CA.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list |
|---|---|---|---|---|
| Stanford Health Care lowest Stanford, CA · (650) 723-4000 HC 6956 12810r Phosphorus File of Apr 1, 2026 · source file | $7.61 | $19.03 | — | 60% |
| Lucile Salter Packard Children's Hospital at Stanford Palo Alto, CA · (650) 497-8000 HC 114 12810r Phosphorus File of Mar 31, 2026 · source file | $9.51 | $19.03 | $9.25 | 50% |
| Kaiser Foundation Hospital - San Jose San Jose, CA · (408) 972-7000 ASSAY OF PHOSPHORUS INORGANIC source file | $75.60 | $135.00 | $5.00–$15.00 | 44% |
| Kaiser Foundation Hospital - Santa Clara Santa Clara, CA · (408) 236-6400 ASSAY OF PHOSPHORUS INORGANIC source file | $75.60 | $135.00 | $5.00–$15.00 | 44% |
| Good Samaritan Hospital Los Gatos, CA · (408) 559-2011 PHOSPHORUS OTHER File of Sep 1, 2026 · source file | $99.88 | $99.88 | $14.98–$99.88 | — |
| El Camino Hospital Mountain View, CA · (650) 940-7000 HC PHOSPHOROUS File of Apr 1, 2026 · source file | $103.25 | $413.00 | — | 75% |
| Stanford Health Care Stanford, CA · (650) 723-4000 HC Phosphorus Serum/ File of Apr 1, 2026 · source file | $161.20 | $403.00 | — | 60% |
| Lucile Salter Packard Children's Hospital at Stanford Palo Alto, CA · (650) 497-8000 HC Phosporus Custom File of Mar 31, 2026 · source file | $184.50 | $369.00 | $179.30 | 50% |
| Lucile Salter Packard Children's Hospital at Stanford Palo Alto, CA · (650) 497-8000 HC Phosphorus Serum/ File of Mar 31, 2026 · source file | $201.50 | $403.00 | $195.82 | 50% |
| Lucile Salter Packard Children's Hospital at Stanford Palo Alto, CA · (650) 497-8000 HC Phosphorus Serum Inorganic File of Mar 31, 2026 · source file | $291.00 | $582.00 | $282.79 | 50% |
| Good Samaritan Hospital Los Gatos, CA · (408) 559-2011 PHOSPHORUS BLD File of Sep 1, 2026 · source file | $471.75 | $471.75 | $70.76–$471.75 | — |
Outpatient: lowest $7.61, median $75.60, highest $103.25 — a 13.6× difference within the same market.
As an inpatient, the same code is billed by 4 facilities here, median $75.60. 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 0 of 4 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.