C-peptide test cost in Rockford, IL
In Rockford, IL, 1 hospital lists a cash price for C-peptide blood test: from $285.65 to $285.65, with a median of $285.65. Across Illinois, the median is $103.60 at 100 hospitals.
Cash prices at 1 facility for code 84681, as an outpatient — the setting a self-pay patient normally buys. Collected Sep 29, 2026; the hospital files themselves were last updated between Mar 1, 2026 and Mar 1, 2026.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list | File date |
|---|---|---|---|---|---|
| Rockford Memorial Hospital Rockford, IL · (815) 968-6861 CHG ASSAY OF C-PEPTIDE | $285.65 | $380.87 | — | 25% | Mar 1, 2026 source file |
Outpatient: lowest $285.65, median $285.65, highest $285.65.
As an inpatient, the same code is billed by 1 facility here, median $285.65. Inpatient and outpatient prices are not comparable and are kept on separate pages: the inpatient charge covers admission, not the same purchase.
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.