C-peptide test cost in Seattle, WA — inpatient
In Seattle-Tacoma-Bellevue, WA, 18 hospitals list a cash price for C-peptide blood test as an inpatient: from $13.20 to $196.35, with a median of $104.89. The lowest listed price is at Overlake Medical Center & Clinics — $91.69 less than the median here. Across Washington, the median is $109.67 at 60 hospitals.
Cash prices at 18 facilities across 14 cities for code 84681, as an inpatient (admitted to hospital) . Collected Sep 27, 2026; the hospital files themselves were last updated between Feb 28, 2026 and Apr 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 Seattle-Tacoma-Bellevue, WA.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list |
|---|---|---|---|---|
| Overlake Medical Center & Clinics lowest Bellevue, WA · (425) 688-5000 Hc C-Peptide, Serum File of Apr 1, 2026 · source file | $13.20 | $26.40 | — | 50% |
| Virginia Mason Medical Center Seattle, WA · (206) 223-6600 C-PEPTIDE source file | $71.40 | $140.00 | $89.67–$112.00 | 49% |
| Saint Clare Hospital Lakewood, WA · (253) 588-1711 HC C-PEPTIDE File of Feb 28, 2026 · source file | $74.68 | $259.06 | $186.53–$194.30 | 71% |
| St Anthony Hospital Gig Harbor, WA · (253) 530-2050 HC C-PEPTIDE File of Feb 28, 2026 · source file | $78.80 | $259.06 | $186.53–$194.30 | 70% |
| Highline Medical Center Burien, WA · (206) 431-5237 HC C-PEPTIDE File of Feb 28, 2026 · source file | $79.11 | $259.06 | $111.40–$233.16 | 69% |
| St Francis Community Hospital Federal Way, WA · (253) 944-8100 HC C-PEPTIDE File of Feb 28, 2026 · source file | $81.30 | $259.06 | $186.53–$194.30 | 69% |
| St Joseph Medical Center Tacoma, WA · (253) 627-4101 HC C-PEPTIDE File of Feb 28, 2026 · source file | $85.81 | $259.06 | $186.53–$194.30 | 67% |
| St Elizabeth Hospital Enumclaw, WA · (360) 825-2505 HC C-PEPTIDE File of Feb 28, 2026 · source file | $91.55 | $259.06 | $72.54–$233.16 | 65% |
| Cascade Valley Hospital Arlington, WA · (360) 435-2133 HC C-PEPTIDE source file | $103.20 | $129.00 | $22.47–$116.10 | 20% |
| Snoqualmie Valley Hospital Snoqualmie, WA · (425) 831-2300 Facility Fee HC C-PEPTIDE, SERUM source file | $106.57 | $183.74 | $20.39–$169.04 | 42% |
| Kaiser Permanente Central Hospital Seattle, WA · (206) 326-3000 C-PEPTIDE File of Apr 1, 2026 · source file | $114.40 | $143.00 | $16.00–$56.00 | 20% |
| Swedish Medical Center / Cherry Hill Seattle, WA · (206) 320-2000 HC ASSAY OF C PEPTIDE LAB File of Apr 1, 2026 · source file | $141.60 | $295.00 | — | 52% |
| Swedish Issaquah Issaquah, WA · (425) 313-4000 HC ASSAY OF C PEPTIDE LAB File of Apr 1, 2026 · source file | $141.60 | $295.00 | — | 52% |
| Swedish Medical Center Seattle, WA · (206) 386-6000 HC ASSAY OF C PEPTIDE LAB File of Apr 1, 2026 · source file | $141.60 | $295.00 | — | 52% |
| Swedish Issaquah Issaquah, WA · (425) 313-4000 HC ASSAY OF C-PEPTIDE CDM File of Apr 1, 2026 · source file | $150.72 | $314.00 | — | 52% |
| Swedish Medical Center / Cherry Hill Seattle, WA · (206) 320-2000 HC ASSAY OF C-PEPTIDE CDM File of Apr 1, 2026 · source file | $150.72 | $314.00 | — | 52% |
| Swedish Edmonds Edmonds, WA · (425) 640-4000 HC ASSAY OF C-PEPTIDE CDM File of Apr 1, 2026 · source file | $150.72 | $314.00 | — | 52% |
| Swedish Medical Center Seattle, WA · (206) 386-6000 HC ASSAY OF C-PEPTIDE CDM File of Apr 1, 2026 · source file | $150.72 | $314.00 | — | 52% |
| Providence Regional Medical Center Everett Everett, WA · (425) 261-2000 HC ASSAY OF C-PEPTIDE CDM File of Apr 1, 2026 · source file | $163.28 | $314.00 | — | 48% |
| Valley Medical Center Renton, WA · (425) 228-3450 Assay of C-Peptide source file | $170.10 | $243.00 | — | 30% |
| Franciscan Specialty Care Tacoma, WA C-PEPTIDE File of Mar 16, 2026 · source file | $196.35 | $196.35 | $196.35 | — |
Inpatient: lowest $13.20, median $104.89, highest $196.35 — a 14.9× difference within the same market.
As an outpatient, the same code is billed by 18 facilities here, median $104.89 — that is the price to compare if you are not being admitted.
Cash or insurance?
At 9 of 11 hospitals that publish insurer rates for this code here, the cash price is below the highest rate a health plan has negotiated, and at 6 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 C-peptide test shows how much insulin the pancreas is making. It helps tell type 1 from type 2 diabetes and find the cause of low blood sugar.
What the price covers
The price usually covers running the test. The blood draw (36415) is often billed as a separate line.