Lab tests CPT 84439 Illinois Outpatient

Free T4 test cost in Illinois

In Illinois, 65 hospitals publish a cash price for Free T4 (free thyroxine) thyroid blood test: from $8.00 to $213.00, with a median of $82.08. The lowest price is at Uchicago Medicine Adventhealth Bolingbrook (Bolingbrook) and 3 other hospitals. The highest price is 26.6× the lowest.

Outpatient cash prices, one line per hospital — its lowest listed price for code 84439. Prices for both sides of the body and inpatient prices are not mixed in. Collected Sep 23, 2026.

Lowest$8.00Uchicago Medicine Adventhealth Bolingbrook + 3 more

Median$82.08half pay less

Highest$213.00in Illinois

Lowest saves$74.08vs the median

Hospitals in Illinois, cheapest first

Hospital	Cash price	List price	File date
Uchicago Medicine Adventhealth Bolingbrook lowest Bolingbrook · Chicago-Naperville-Elgin, IL-IN HC T4 FREE - THYROXINE FREE	$8.00	$32.00	Apr 1, 2026 source file
Uchicago Medicine Adventhealth Glenoaks lowest Glendale Heights · Chicago-Naperville-Elgin, IL-IN HC T4 FREE BY DIALYSIS - ARUP	$8.00	$32.00	Apr 1, 2026 source file
Uchicago Medicine Adventhealth Hinsdale lowest Hinsdale · Chicago-Naperville-Elgin, IL-IN HC T4 FREE BY DIALYSIS - ARUP	$8.00	$32.00	Apr 1, 2026 source file
Uchicago Medicine Adventhealth La Grange lowest La Grange · Chicago-Naperville-Elgin, IL-IN HC T4 FREE - THYROXINE FREE	$8.00	$32.00	Apr 1, 2026 source file
Mercy Medical Center Aurora · Chicago-Naperville-Elgin, IL-IN T4 FREE, DIRECT DIALYSIS	$9.00	$256.00	Sep 1, 2026 source file
Saint Francis Hospital Evanston · Chicago-Naperville-Elgin, IL-IN HC ASSAY OF FREE THYROXINE	$9.00	$106.00	Sep 1, 2026 source file
Roseland Community Hospital Association Chicago · Chicago-Naperville-Elgin, IL-IN Thyroxine (thyroid chemical), free	$13.43	$45.00	Jul 1, 2026 source file
Gottlieb Memorial Hospital Melrose Park · Chicago-Naperville-Elgin, IL-IN Free T4 (Qfrt4d)	$19.00	$100.00	Mar 31, 2026 source file
Trinity Medical Center Rock Island · Davenport-Moline-Rock Island, IA-IL ASSAY OF FREE THYROXINE	$22.40	$28.00	Jan 28, 2026 source file
Loyola University Medical Center Maywood · Chicago-Naperville-Elgin, IL-IN Free T4 (Qfrt4d)	$23.00	$100.00	Mar 31, 2026 source file
Deaconess Illinois Crossroads Inc Mount Vernon · Mount Vernon, IL CHG ASSAY OF FREE THYROXINE	$23.80	$68.00	Feb 3, 2026 source file
Deaconess Illinois Union County Hospital Inc Anna · Anna, IL T4 FREE	$23.80	$68.00	Feb 3, 2026 source file
Deaconess Regional Healthcare Services Illinois Inc Marion · Marion-Herrin, IL CHG ASSAY OF FREE THYROXINE	$23.80	$68.00	Feb 3, 2026 source file
MercyOne Genesis Aledo Medical Center Aledo · Davenport-Moline-Rock Island, IA-IL _T4F - Sendout	$31.20	$52.00	Mar 31, 2026 source file
Presence Chicago Hospitals Network Chicago · Chicago-Naperville-Elgin, IL-IN HC T4 FREE DIRECT DIALYSIS	$34.98	$106.00	— source file
American Healthcare Systems Illinois LLC Granite City · St. Louis, MO-IL THYROXINE T4, FREE	$39.91	$66.52	— source file
MercyOne Genesis Silvis Medical Center Silvis · Davenport-Moline-Rock Island, IA-IL Thyroxine Free	$43.80	$73.00	Mar 31, 2026 source file
La Rabida Children's Hospital\|LaRabida Childrens Hospital Chicago · Chicago-Naperville-Elgin, IL-IN FREE T4	$58.61	$58.61	Apr 1, 2026 source file
Advocate Childrens Hospital Oak Lawn Oak Lawn · Chicago-Naperville-Elgin, IL-IN T4, FREE	$65.00	$130.00	Nov 4, 2025 source file
Advocate Childrens Hospital Park Ridge Park Ridge · Chicago-Naperville-Elgin, IL-IN T4, FREE	$65.00	$130.00	Nov 4, 2025 source file
Advocate Christ Medical Center Oak Lawn · Chicago-Naperville-Elgin, IL-IN T4, FREE	$65.00	$130.00	Nov 4, 2025 source file
Advocate Condell Medical Center Libertyville · Chicago-Naperville-Elgin, IL-IN T4, FREE	$65.00	$130.00	Nov 4, 2025 source file
Advocate Good Samaritan Hospital Downers Grove · Chicago-Naperville-Elgin, IL-IN T4, FREE	$65.00	$130.00	Nov 4, 2025 source file
Advocate Good Shepherd Hospital Barrington · Chicago-Naperville-Elgin, IL-IN T4, FREE	$65.00	$130.00	Nov 4, 2025 source file
Advocate Illinois Masonic Medical Center Chicago · Chicago-Naperville-Elgin, IL-IN T4, FREE	$65.00	$130.00	Nov 4, 2025 source file
Advocate Lutheran General Hospital Park Ridge · Chicago-Naperville-Elgin, IL-IN T4, FREE	$65.00	$130.00	Nov 4, 2025 source file
Advocate Sherman Hospital Elgin · Chicago-Naperville-Elgin, IL-IN T4, FREE	$65.00	$130.00	Nov 4, 2025 source file
Advocate South Suburban Hospital Hazel Crest · Chicago-Naperville-Elgin, IL-IN T4, FREE	$65.00	$130.00	Nov 4, 2025 source file
Advocate Trinity Hospital Chicago · Chicago-Naperville-Elgin, IL-IN T4, FREE	$65.00	$130.00	Nov 4, 2025 source file
Riverside Medical Center Kankakee · Kankakee, IL THYROXINE (THYROID CHEMICAL); FREE	$65.49	$246.00	— source file
Humboldt Park Health North Francisco Chicago · Chicago-Naperville-Elgin, IL-IN Thyroxine (thyroid chemical), free	$74.97	$267.75	Aug 24, 2026 source file
Shriners Childrens - Chicago Chicago · Chicago-Naperville-Elgin, IL-IN THYROXINE (THYROID CHEMICAL); FREE	$77.40	$77.40	— source file
Hshs Good Shepherd Hospital Inc Shelbyville · Shelbyville, IL HC T4 FREE	$82.08	$114.00	— source file
Northwest Community Hospital Arlington Heights · Chicago-Naperville-Elgin, IL-IN Hb Assay Of Free Thyroxine	$85.00	$85.00	Apr 1, 2026 source file
The University of Chicago Medical Center Chicago · Chicago-Naperville-Elgin, IL-IN Hc Thyroxine, Fti-Laf	$85.00	$85.00	Apr 1, 2026 source file
Community First Healthcare of Illinois INC Chicago · Chicago-Naperville-Elgin, IL-IN Thyroxine (thyroid chemical), free	$96.38	$192.75	Apr 1, 2026 source file
St Josephs Hospital Hospital Sisters Third Order of St Francis Breese · St. Louis, MO-IL HC T4 FREE	$102.96	$143.00	— source file
St Francis Hospital Sisters of the Third Order of St Francis Litchfield · Litchfield, IL HC T4 FREE	$112.32	$156.00	— source file
NorthShore University HealthSystems Evanston Hospital Evanson · Chicago-Naperville-Elgin, IL-IN R Thyroxine (T4); Free by Dialysis (P)	$115.05	$177.00	— source file
NorthShore University HealthSystems Glenbrook Hospital Glenview · Chicago-Naperville-Elgin, IL-IN R Thyroxine (T4); Free by Dialysis (P)	$115.05	$177.00	— source file
NorthShore University HealthSystems Highland Park Hospital Highland Park · Chicago-Naperville-Elgin, IL-IN R Thyroxine (T4); Free by Dialysis (P)	$115.05	$177.00	— source file
NorthShore University HealthSystems Skokie Hospital Skokie · Chicago-Naperville-Elgin, IL-IN Thyroxine Free*	$115.05	$177.00	— source file
St Anthonys Memorial Hospital of the Hospital Sisters of the Third Order of St Francis Mattoon · Charleston-Mattoon, IL HC T4 FREE	$118.80	$165.00	— source file
Northern Illinois Medical Center DBA Northwestern Medicine McHenry Hospital McHenry · Chicago-Naperville-Elgin, IL-IN HB Ref Thyroxine, Free, Direct Dialysis (Mayo)	$121.10	$173.00	Apr 1, 2026 source file
Northwestern Lake Forest Hospital Lake Forest · Chicago-Naperville-Elgin, IL-IN HB Ref Thyroxine, Free, Direct Dialysis (Mayo)	$121.10	$173.00	Apr 1, 2026 source file
Northwestern Medicine Central DuPage Hospital Winfield · Chicago-Naperville-Elgin, IL-IN HB T4, Free	$121.10	$173.00	Apr 1, 2026 source file
Northwestern Medicine Delnor Hospital Geneva · Chicago-Naperville-Elgin, IL-IN HB Ref T4, Free (Lc)	$121.10	$173.00	Apr 1, 2026 source file
Northwestern Medicine Kishwaukee Hospital Dekalb · Chicago-Naperville-Elgin, IL-IN HB T4, Free	$121.10	$173.00	Apr 1, 2026 source file
Northwestern Medicine Marianjoy Rehabilitation Hospital Wheaton · Chicago-Naperville-Elgin, IL-IN HB Ref T4, Free (Lc)	$121.10	$173.00	Apr 1, 2026 source file
Northwestern Medicine Valley West Hospital Sandwich · Chicago-Naperville-Elgin, IL-IN HB Ref T4, Free (Lc)	$121.10	$173.00	Apr 1, 2026 source file
Palos Community Hospital Palos Heights · Chicago-Naperville-Elgin, IL-IN HB Ref Free T4 (Gva)	$121.10	$173.00	Apr 1, 2026 source file
Resilience Healthcare West Suburban Medical Center LLC Oak Park · Chicago-Naperville-Elgin, IL-IN Thyroxine (T4) Free Direct SO	$125.24	$368.36	Mar 17, 2025 source file
St Elizabeths Hospital of the Hospital Sisters of the Third Order of St Francis O'Fallon · St. Louis, MO-IL HC T4 FREE	$127.44	$177.00	— source file
St Josephs Hospital of the Hospital Sisters of the Third Order of St Francis Highland · St. Louis, MO-IL HC T4 FREE	$136.80	$190.00	— source file
Resilience Healthcare Weiss Memorial Hospital LLC Chicago · Chicago-Naperville-Elgin, IL-IN Thyroxine (T4) Free Direct SO	$145.95	$429.27	Mar 17, 2025 source file
St Johns Hospital of the Hospital Sisters of the Third Order of St Francis Springfield · Springfield, IL HC T4 FREE	$159.12	$221.00	— source file
Hshs Holy Family Hospital Inc Greenville · St. Louis, MO-IL HC T4 FREE	$167.04	$232.00	— source file
St Marys Hospital Decatur of Hospital Sisters of the Third Order of St Francis Decatur · Decatur, IL HC T4 FREE	$167.76	$233.00	— source file
Edward Hospital Naperville · Chicago-Naperville-Elgin, IL-IN HC THYROXINE FREE	$175.00	$175.00	Apr 1, 2026 source file
Elmhurst Memorial Hospital Elmhurst · Chicago-Naperville-Elgin, IL-IN HC THYROXINE FREE	$175.00	$175.00	Apr 1, 2026 source file
Endeavor Health Clinical Operations Evanston · Chicago-Naperville-Elgin, IL-IN HB THYROXINE, FREE*	$177.00	$177.00	Apr 1, 2026 source file
Endeavor Health Clinical Operations Highland Park · Chicago-Naperville-Elgin, IL-IN HB THYROXINE, FREE*	$177.00	$177.00	Apr 1, 2026 source file
Swedish Covenant Health Chicago · Chicago-Naperville-Elgin, IL-IN HB R THYROXINE (T4); FREE BY DIALYSIS (P)	$177.00	$177.00	Apr 1, 2026 source file
Ann & Robert H. Lurie Children's Hospital of Chicago Chicago · Chicago-Naperville-Elgin, IL-IN H THYROXINE FREE (FT4) SERUM	$201.60	$288.00	— source file
Ingalls Memorial Hospital Harvey · Chicago-Naperville-Elgin, IL-IN Hc Thyroxine, Free	$213.00	$213.00	Apr 1, 2026 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	$8.00	$81.20
St. Louis, MO-IL	5	$39.91	$127.44
Davenport-Moline-Rock Island, IA-IL	3	$22.40	$31.20
Anna, IL	1	$23.80	$23.80
Charleston-Mattoon, IL	1	$118.80	$118.80
Decatur, IL	1	$167.76	$167.76
Kankakee, IL	1	$65.49	$65.49
Litchfield, IL	1	$112.32	$112.32
Marion-Herrin, IL	1	$23.80	$23.80
Mount Vernon, IL	1	$23.80	$23.80
Shelbyville, IL	1	$82.08	$82.08
Springfield, IL	1	$159.12	$159.12

What it is

A free T4 test measures thyroxine that is not bound to proteins, the active form of the main thyroid hormone. It is usually ordered with or after a TSH test to check for an underactive or overactive thyroid and to adjust thyroid medicine.

What the price covers

The price usually covers the free T4 test only. The blood draw and the TSH test (84443) are billed separately.

Free T4 (free thyroxine) thyroid blood test in other states

Median cash price across the state's hospitals.