BUN test cost in St. Louis, MO
In St. Louis, MO-IL, 17 hospitals list a cash price for blood urea nitrogen (BUN) test: from $4.55 to $88.90, with a median of $47.00. The lowest listed price is at Mercy Hospital St Louis — $42.45 less than the median here. Across Missouri, the median is $37.70 at 63 hospitals.
Cash prices at 17 facilities across 15 cities for code 84520, as an outpatient — the setting a self-pay patient normally buys. Collected Sep 27, 2026; the hospital files themselves were last updated between Feb 6, 2026 and Apr 24, 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 Hospital St Louis lowest Saint Louis, MO · (314) 251-6000 Bun Blood Urea Nitrogen | $4.55 | $7.00 | $3.56–$8.89 | 35% | — source file |
| Ranken Jordan Pediatric Bridge Hospital Maryland Heights, MO · (314) 872-6400 Blood Urea Nitrogen | $6.94 | $8.67 | — | 20% | Apr 24, 2026 source file |
| Mercy Hospital South Saint Louis, MO · (314) 525-1000 Bun Blood Urea Nitrogen | $14.30 | $22.00 | $1.43–$22.00 | 35% | — source file |
| Gateway Regional Medical Center Granite City, IL · (618) 798-3000 UREA NITROGEN,QUAN | $17.51 | $29.19 | $29.19 | 40% | — source file |
| Shriners Childrens - St Louis Saint Louis, MO · (314) 432-3600 ASSAY OF UREA NITROGEN | $31.00 | $31.00 | $2.27–$6.79 | — | — source file |
| Touchette Regional Hospital Cahokia Heights, IL · (618) 332-3060 Urea nitrogen; quantitative | $36.58 | $59.00 | $2.24–$56.00 | 38% | — source file |
| Mercy Hospital Jefferson Festus, MO · (636) 933-1000 Bun Blood Urea Nitrogen | $37.70 | $58.00 | $3.56–$8.89 | 35% | — source file |
| Mercy Hospital St Louis Saint Louis, MO · (314) 251-6000 POC Bun Blood Urea Nitrogen | $37.70 | $58.00 | $3.56–$8.89 | 35% | — source file |
| Mercy Hospital Washington Washington, MO · (636) 239-8000 POC Bun Blood Urea Nitrogen | $39.00 | $60.00 | $3.56–$6.67 | 35% | — source file |
| Mercy Hospital Washington Washington, MO · (636) 239-8000 Bun Blood Urea Nitrogen | $39.00 | $60.00 | $3.56–$6.67 | 35% | — source file |
| Mercy Hospital South Saint Louis, MO · (314) 525-1000 POC Bun Blood Urea Nitrogen | $41.60 | $64.00 | $4.16–$64.00 | 35% | — source file |
| Mercy Hospital Jefferson Festus, MO · (636) 933-1000 POC Bun Blood Urea Nitrogen | $46.80 | $72.00 | $4.68–$72.00 | 35% | — source file |
| Jersey Community Hospital Jerseyville, IL · (618) 498-6402 Blood Urea Nitrogen | $47.00 | $47.00 | $24.58–$39.95 | — | — source file |
| Mercy Hospital Lincoln Troy, MO · (636) 528-8551 POC Bun Blood Urea Nitrogen | $48.75 | $75.00 | $3.95–$5.59 | 35% | — source file |
| Mercy Hospital Lincoln Troy, MO · (636) 528-8551 Bun Blood Urea Nitrogen | $52.65 | $81.00 | $5.27–$81.00 | 35% | — source file |
| St Elizabeths Hospital of the Hospital Sisters of the Third Order of St Francis O'Fallon, IL · (618) 234-2120 HC BUN | $53.28 | $74.00 | $3.80–$74.00 | 28% | — source file |
| Community Hospital of Staunton Staunton, IL · (618) 635-2200 BLOOD UREA NITROGEN | $55.70 | $111.40 | $32.21–$101.37 | 50% | Feb 9, 2026 source file |
| St Josephs Hospital Hospital Sisters Third Order of St Francis Breese, IL · (618) 526-4511 ASSAY OF UREA NITROGEN | $56.88 | $79.00 | $3.80–$79.00 | 28% | — source file |
| Anderson Hospital Maryville, IL · (618) 288-5711 BLOOD UREA NITROGEN | $65.15 | $130.30 | $3.70–$117.27 | 50% | Feb 6, 2026 source file |
| Hshs Holy Family Hospital Greenville, IL · (618) 664-1230 HC BUN | $67.68 | $94.00 | $3.95–$94.00 | 28% | — source file |
| St Josephs Hospital of the Hospital Sisters of the Third Order of St Francis Highland, IL · (618) 651-2600 ASSAY OF UREA NITROGEN | $85.68 | $119.00 | $3.95–$119.00 | 28% | — source file |
| Carlinville Area Hospital Carlinville, IL · (217) 854-3141 BUN SERUM | $88.90 | $127.00 | $45.72–$181.43 | 30% | — source file |
Outpatient: lowest $4.55, median $47.00, highest $88.90 — a 19.5× difference within the same market.
As an inpatient, the same code is billed by 12 facilities here, median $56.29. 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 11 of 16 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
A BUN test measures urea nitrogen, a waste product removed by the kidneys. It is used with creatinine to check kidney function and hydration.
What the price covers
The price usually covers running the test. The blood draw (36415) is often billed as a separate line.