CA-125 test cost in St. Louis, MO — inpatient
In St. Louis, MO-IL, 5 hospitals list a cash price for CA-125 blood test (ovarian cancer marker) as an inpatient: from $72.10 to $482.81, with a median of $198.00. The lowest listed price is at Mercy Rehabilitation Hospital South — $125.90 less than the median here. Across Missouri, the median is $111.48 at 26 hospitals.
Cash prices at 5 facilities across 5 cities for code 86304, as an inpatient (admitted to hospital) . Collected Sep 23, 2026; the hospital files themselves were last updated between Mar 16, 2026 and Mar 16, 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 St. Louis, MO-IL.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list | File date |
|---|---|---|---|---|---|
| Mercy Rehabilitation Hospital South lowest Louis, MO CA 125 ANTIBODY | $72.10 | $72.10 | $72.10 | — | Mar 16, 2026 source file |
| St Josephs Hospital of the Hospital Sisters of the Third Order of St Francis Highland, IL · (618) 651-2600 HC TUMOR AG CA 125 | $105.12 | $146.00 | $18.83–$146.00 | 28% | — source file |
| Hshs Holy Family Hospital Greenville, IL · (618) 664-1230 HC TUMOR AG CA 125 -90 | $198.00 | $275.00 | $8.50–$275.00 | 28% | — source file |
| Mercy Rehabilitation Hospital St. Louis Chesterfield, MO CA 125 ANTIBODY | $380.72 | $380.72 | $380.72 | — | Mar 16, 2026 source file |
| Gateway Regional Medical Center Granite City, IL · (618) 798-3000 TUMOR AG CA 125 | $482.81 | $804.69 | $804.69 | 40% | — source file |
Inpatient: lowest $72.10, median $198.00, highest $482.81 — a 6.7× difference within the same market.
As an outpatient, the same code is billed by 8 facilities here, median $116.68 — that is the price to compare if you are not being admitted.
Cash or insurance?
At 3 of 5 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
CA-125 is a protein that can be high in ovarian cancer. The test is used to evaluate some pelvic masses and to follow treatment.
What the price covers
The price usually covers running the test. The blood draw (36415) is often billed as a separate line.