Lab tests CPT 86431 Illinois Outpatient

Rheumatoid factor test cost in Illinois

In Illinois, 65 hospitals publish a cash price for rheumatoid factor (RF) test: from $5.00 to $236.88, with a median of $37.50. The lowest price is at Mercy Medical Center (Aurora) and 5 other hospitals. The highest price is 47.4× the lowest.

Outpatient cash prices, one line per hospital — its lowest listed price for code 86431. Prices for both sides of the body and inpatient prices are not mixed in. Collected Sep 23, 2026.

Lowest$5.00Mercy Medical Center + 5 more

Median$37.50half pay less

Highest$236.88in Illinois

Lowest saves$32.50vs the median

Hospitals in Illinois, cheapest first

Hospital	Cash price	List price	File date
Mercy Medical Center lowest Aurora · Chicago-Naperville-Elgin, IL-IN RHEUMATOID FACTOR QUANT	$5.00	$147.00	Sep 1, 2026 source file
Saint Francis Hospital lowest Evanston · Chicago-Naperville-Elgin, IL-IN HC RHEUMATOID FACTOR, QUANT	$5.00	$175.00	Sep 1, 2026 source file
Uchicago Medicine AdventHealth Bolingbrook lowest Bolingbrook · Chicago-Naperville-Elgin, IL-IN HC RHEUMATOID FACTOR, QUANT - LUPUS COMPREHENSIVE REFLEXIVE PANEL - ARUP	$5.00	$20.00	Apr 1, 2026 source file
Uchicago Medicine AdventHealth Glenoaks lowest Glendale Heights · Chicago-Naperville-Elgin, IL-IN HC RHEUMATOID FACTOR, QUANT - RHEUMATOID FACTOR	$5.00	$20.00	Apr 1, 2026 source file
Uchicago Medicine AdventHealth Hinsdale lowest Hinsdale · Chicago-Naperville-Elgin, IL-IN HC RHEUMATOID FACTOR, QUANT - RHEUMATOID FACTOR	$5.00	$20.00	Apr 1, 2026 source file
Uchicago Medicine AdventHealth La Grange lowest La Grange · Chicago-Naperville-Elgin, IL-IN HC RHEUMATOID FACTOR, QUANT - LUPUS COMPREHENSIVE REFLEXIVE PANEL - ARUP	$5.00	$20.00	Apr 1, 2026 source file
Northwestern Lake Forest Hospital Lake Forest · Chicago-Naperville-Elgin, IL-IN HB Ref Anachoice Panel 1, Rheumatoid Factor Quant (Q)	$9.10	$13.00	Apr 1, 2026 source file
Roseland Community Hospital Association Chicago · Chicago-Naperville-Elgin, IL-IN Rheumatoid factor level	$11.72	$7.00	Jul 1, 2026 source file
Trinity Medical Center Rock Island · Davenport-Moline-Rock Island, IA-IL CHG RHEUMATOID FACTOR, QUANT	$14.40	$18.00	Jan 28, 2026 source file
Deaconess Illinois Crossroads Mount Vernon · Mount Vernon, IL CHG RHEUMATOID FACTOR QUANTITATIVE	$15.05	$43.00	Feb 3, 2026 source file
Deaconess Illinois Union County Hospital Anna · Anna, IL RHEUMATOID FACTOR, FLUID	$15.05	$43.00	Feb 3, 2026 source file
Heartland Regional Medical Center Marion · Marion-Herrin, IL CHG RHEUMATOID FACTOR QUANTITATIVE	$15.05	$43.00	Feb 3, 2026 source file
Northwestern Medicine Central DuPage Hospital Winfield · Chicago-Naperville-Elgin, IL-IN HB Ref Lupus Panel 5, Rheumatoid Factor (Q)	$16.80	$24.00	Apr 1, 2026 source file
Northwestern Medicine Delnor Hospital Geneva · Chicago-Naperville-Elgin, IL-IN HB Ref Lupus Panel 5, Rheumatoid Factor (Q)	$16.80	$24.00	Apr 1, 2026 source file
Northwestern Medicine Kishwaukee Hospital DeKalb · Chicago-Naperville-Elgin, IL-IN HB Ref Lupus Panel 5, Rheumatoid Factor (Q)	$16.80	$24.00	Apr 1, 2026 source file
Northwestern Medicine Marianjoy Rehabilitation Hospital Wheaton · Chicago-Naperville-Elgin, IL-IN HB Ref Lupus Panel 5, Rheumatoid Factor (Q)	$16.80	$24.00	Apr 1, 2026 source file
Northwestern Medicine McHenry Hospital McHenry · Chicago-Naperville-Elgin, IL-IN HB Ref Lupus Panel 5, Rheumatoid Factor (Q)	$16.80	$24.00	Apr 1, 2026 source file
Northwestern Medicine Valley West Hospital Sandwich · Chicago-Naperville-Elgin, IL-IN HB Ref Lupus Panel 5, Rheumatoid Factor (Q)	$16.80	$24.00	Apr 1, 2026 source file
Palos Community Hospital Palos Heights · Chicago-Naperville-Elgin, IL-IN HB Ref Lupus Panel 5, Rheumatoid Factor (Q)	$16.80	$24.00	Apr 1, 2026 source file
MercyOne Genesis Aledo Medical Center Aledo · Davenport-Moline-Rock Island, IA-IL Rheumatoid Factor (RF) IgM-Sendout	$19.80	$33.00	Mar 31, 2026 source file
Gottlieb Memorial Hospital Melrose Park · Chicago-Naperville-Elgin, IL-IN Rheumatoid Factor Qt	$26.22	$138.00	Mar 31, 2026 source file
MercyOne Genesis Silvis Medical Center Silvis · Davenport-Moline-Rock Island, IA-IL Rheumatoid Factor (RF) IgM-Sendout	$26.40	$44.00	Mar 31, 2026 source file
Riverside Medical Center Kankakee · Kankakee, IL RHEUMATOID FACTOR LEVEL	$26.62	$100.00	— source file
Humboldt Park Health Chicago · Chicago-Naperville-Elgin, IL-IN Rheumatoid factor level	$26.75	$95.55	Aug 24, 2026 source file
Loyola University Medical Center Maywood · Chicago-Naperville-Elgin, IL-IN Rheumatoid Factor Qt	$31.74	$138.00	Mar 31, 2026 source file
Gateway Regional Medical Center Granite City · St. Louis, MO-IL RHEUMATOID FACT QUAN	$33.51	$55.85	— source file
La Rabida Children's Hospital\|LaRabida Childrens Hospital Chicago · Chicago-Naperville-Elgin, IL-IN RHEUMATOID FACTOR	$37.01	$37.01	Apr 1, 2026 source file
Advocate Childrens Hospital Oak Lawn Oak Lawn · Chicago-Naperville-Elgin, IL-IN RHEUMATOID FACTOR QUANTITATIVE	$37.50	$75.00	Nov 4, 2025 source file
Advocate Childrens Hospital Park Ridge Park Ridge · Chicago-Naperville-Elgin, IL-IN RHEUMATOID FACTOR QUANTITATIVE	$37.50	$75.00	Nov 4, 2025 source file
Advocate Christ Medical Center Oak Lawn · Chicago-Naperville-Elgin, IL-IN RHEUMATOID FACTOR QUANTITATIVE	$37.50	$75.00	Nov 4, 2025 source file
Advocate Condell Medical Center Libertyville · Chicago-Naperville-Elgin, IL-IN RHEUMATOID FACTOR QUANTITATIVE	$37.50	$75.00	Nov 4, 2025 source file
Advocate Good Samaritan Hospital Downers Grove · Chicago-Naperville-Elgin, IL-IN RHEUMATOID FACTOR QUANTITATIVE	$37.50	$75.00	Nov 4, 2025 source file
Advocate Good Shepherd Hospital Barrington · Chicago-Naperville-Elgin, IL-IN RHEUMATOID FACTOR QUANTITATIVE	$37.50	$75.00	Nov 4, 2025 source file
Advocate Illinois Masonic Medical Center Chicago · Chicago-Naperville-Elgin, IL-IN RHEUMATOID FACTOR QUANTITATIVE	$37.50	$75.00	Nov 4, 2025 source file
Advocate Lutheran General Hospital Park Ridge · Chicago-Naperville-Elgin, IL-IN RHEUMATOID FACTOR QUANTITATIVE	$37.50	$75.00	Nov 4, 2025 source file
Advocate Sherman Hospital Elgin · Chicago-Naperville-Elgin, IL-IN RHEUMATOID FACTOR QUANTITATIVE	$37.50	$75.00	Nov 4, 2025 source file
Advocate South Suburban Hospital Hazel Crest · Chicago-Naperville-Elgin, IL-IN RHEUMATOID FACTOR QUANTITATIVE	$37.50	$75.00	Nov 4, 2025 source file
Advocate Trinity Hospital Chicago · Chicago-Naperville-Elgin, IL-IN RHEUMATOID FACTOR QUANTITATIVE	$37.50	$75.00	Nov 4, 2025 source file
Community First Medical Center Chicago · Chicago-Naperville-Elgin, IL-IN Rheumatoid factor level	$41.88	$83.75	Apr 1, 2026 source file
Shriners Childrens - Chicago Chicago · Chicago-Naperville-Elgin, IL-IN RHEUMATOID FACTOR LEVEL	$53.50	$53.50	— source file
The University of Chicago Medical Center Chicago · Chicago-Naperville-Elgin, IL-IN Hc Rheumatoid Factor; Quantitative-Laf	$54.00	$54.00	Apr 1, 2026 source file
Presence Saint Joseph Hospital - Chicago Chicago · Chicago-Naperville-Elgin, IL-IN HC RHEUMATOID FACTOR - RA TEST	$57.75	$175.00	— source file
St Johns Hospital of the Hospital Sisters of the Third Order of St Francis Springfield · Springfield, IL HC RHEUMATOID FACTOR QN	$61.92	$86.00	— source file
Louis A Weiss Memorial Hospital Chicago · Chicago-Naperville-Elgin, IL-IN Rheumatoid Factor	$69.67	$204.92	Mar 17, 2025 source file
Resilience Healthcare West Suburban Medical Center Oak Park · Chicago-Naperville-Elgin, IL-IN Rheumatoid Factor	$79.33	$233.33	Mar 17, 2025 source file
NorthShore University HealthSystems Evanston Hospital Evanson · Chicago-Naperville-Elgin, IL-IN Rheumatoid Factor Quant*	$84.50	$130.00	— source file
NorthShore University HealthSystems Glenbrook Hospital Glenview · Chicago-Naperville-Elgin, IL-IN Rheumatoid Factor Quant*	$84.50	$130.00	— source file
NorthShore University HealthSystems Highland Park Hospital Highland Park · Chicago-Naperville-Elgin, IL-IN Rheumatoid Factor Quant*	$84.50	$130.00	— source file
NorthShore University HealthSystems Skokie Hospital Skokie · Chicago-Naperville-Elgin, IL-IN Rheumatoid Factor Quant*	$84.50	$130.00	— source file
St Josephs Hospital Hospital Sisters Third Order of St Francis Breese · St. Louis, MO-IL HC RHEUMATOID FACTOR QN	$85.68	$119.00	— source file
Hshs Holy Family Hospital Greenville · St. Louis, MO-IL RHEUMATOID FACTOR QUANT	$100.08	$139.00	— source file
St Marys Hospital Decatur of Hospital Sisters of the Third Order of St Francis Decatur · Decatur, IL HC RHEUMATOID FACTOR QN	$105.84	$147.00	— source file
Edward Hospital Naperville · Chicago-Naperville-Elgin, IL-IN HC RHEUMATOID FACTOR QUANTITATIVE	$112.00	$112.00	Apr 1, 2026 source file
Elmhurst Memorial Hospital Elmhurst · Chicago-Naperville-Elgin, IL-IN HC RHEUMATOID FACTOR QUANTITATIVE	$112.00	$112.00	Apr 1, 2026 source file
St Josephs Hospital of the Hospital Sisters of the Third Order of St Francis Highland · St. Louis, MO-IL HC RHEUMATOID FACTOR QN	$112.32	$156.00	— source file
Northwest Community Hospital Arlington Heights · Chicago-Naperville-Elgin, IL-IN Hb Rheumatoid Factor Quant	$123.00	$123.00	Apr 1, 2026 source file
Endeavor Health Clinical Operations Evanston · Chicago-Naperville-Elgin, IL-IN HB RHEUMATOID FACTOR, QUANT*	$130.00	$130.00	Apr 1, 2026 source file
Endeavor Health Clinical Operations Highland Park · Chicago-Naperville-Elgin, IL-IN HB RHEUMATOID FACTOR, QUANT*	$130.00	$130.00	Apr 1, 2026 source file
Swedish Covenant Health Chicago · Chicago-Naperville-Elgin, IL-IN HB RHEUMATOID FACTOR, QUANT*	$130.00	$130.00	Apr 1, 2026 source file
Hshs Good Shepherd Hospital Shelbyville · Shelbyville, IL HC RHEUMATOID FACTOR QN	$133.20	$185.00	— source file
Ann & Robert H. Lurie Children's Hospital of Chicago Chicago · Chicago-Naperville-Elgin, IL-IN RHEUMATOID FACTOR QUANT SERUM	$147.00	$210.00	— source file
Ingalls Memorial Hospital Harvey · Chicago-Naperville-Elgin, IL-IN Hc Rheumatoid Factor; Quantitative	$163.00	$163.00	Apr 1, 2026 source file
St Anthonys Memorial Hospital of the Hospital Sisters of the Third Order of St Francis Mattoon · Charleston-Mattoon, IL HC RHEUMATOID FACTOR QN	$165.60	$230.00	— source file
St Elizabeths Hospital of the Hospital Sisters of the Third Order of St Francis O'Fallon · St. Louis, MO-IL HC RHEUMATOID FACTOR QN	$181.44	$252.00	— source file
St Francis Hospital Sisters of the Third Order of St Francis Litchfield · Litchfield, IL HC RHEUMATOID FACTOR QN	$236.88	$329.00	— source file

By metro area

Each metro page compares every listing, including prices for both sides of the body.

Metro area	Hospitals	Lowest	Median
Chicago-Naperville-Elgin, IL-IN	48	$5.00	$37.50
St. Louis, MO-IL	5	$33.51	$100.08
Davenport-Moline-Rock Island, IA-IL	3	$14.40	$19.80
Anna, IL	1	$15.05	$15.05
Charleston-Mattoon, IL	1	$165.60	$165.60
Decatur, IL	1	$105.84	$105.84
Kankakee, IL	1	$26.62	$26.62
Litchfield, IL	1	$236.88	$236.88
Marion-Herrin, IL	1	$15.05	$15.05
Mount Vernon, IL	1	$15.05	$15.05
Shelbyville, IL	1	$133.20	$133.20
Springfield, IL	1	$61.92	$61.92

What it is

Rheumatoid factor is an antibody found in many people with rheumatoid arthritis. The test is part of the workup for joint pain and swelling.

What the price covers

The price usually covers running the test. The blood draw (36415) is often billed as a separate line.

Rheumatoid factor (RF) test in other states

Median cash price across the state's hospitals.