Free T4 test cost in Chicago, IL — inpatient
In Chicago-Naperville-Elgin, IL-IN, 33 hospitals list a cash price for free T4 (free thyroxine) thyroid blood test as an inpatient: from $8.00 to $213.00, with a median of $65.00. The lowest listed price is at Uchicago Medicine AdventHealth Glenoaks and 3 other hospitals — $57.00 less than the median here. Across Illinois, the median is $82.08 at 65 hospitals.
Cash prices at 33 facilities across 23 cities for code 84439, as an inpatient (admitted to hospital) . Collected Sep 23, 2026; the hospital files themselves were last updated between Mar 17, 2025 and Apr 1, 2026.
Lowest$8.00Uchicago Medicine AdventHealth Glenoaks + 3 more
Median$65.00half pay less
Highest$213.00in this market
Difference26.6×highest vs lowest
Where each hospital's price falls
Each dot is one hospital's cash price on a scale from the lowest to the highest in Chicago-Naperville-Elgin, IL-IN.
median
Lowest $8.00Highest $347.00
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list | File date |
|---|---|---|---|---|---|
| Uchicago Medicine AdventHealth Glenoaks lowest Glendale Heights, IL · (630) 545-8000 HC T4 FREE - THYROXINE FREE | $8.00 | $32.00 | — | 75% | Apr 1, 2026 source file |
| Uchicago Medicine AdventHealth Glenoaks lowest Glendale Heights, IL · (630) 545-8000 HC T4 FREE BY DIALYSIS - ARUP | $8.00 | $32.00 | — | 75% | Apr 1, 2026 source file |
| Uchicago Medicine AdventHealth Glenoaks lowest Glendale Heights, IL · (630) 545-8000 HC T4 FREE - THYROXINE FREE | $8.00 | $32.00 | — | 75% | Apr 1, 2026 source file |
| Uchicago Medicine AdventHealth Glenoaks lowest Glendale Heights, IL · (630) 545-8000 HC T4 FREE BY DIALYSIS - ARUP | $8.00 | $32.00 | — | 75% | Apr 1, 2026 source file |
| Uchicago Medicine AdventHealth La Grange lowest La Grange, IL · (708) 352-1200 HC T4 FREE - THYROXINE FREE | $8.00 | $32.00 | — | 75% | Apr 1, 2026 source file |
| Uchicago Medicine AdventHealth La Grange lowest La Grange, IL · (708) 352-1200 HC T4 FREE BY DIALYSIS - ARUP | $8.00 | $32.00 | — | 75% | Apr 1, 2026 source file |
| Uchicago Medicine AdventHealth La Grange lowest La Grange, IL · (708) 352-1200 HC T4 FREE - THYROXINE FREE | $8.00 | $32.00 | — | 75% | Apr 1, 2026 source file |
| Uchicago Medicine AdventHealth La Grange lowest La Grange, IL · (708) 352-1200 HC T4 FREE BY DIALYSIS - ARUP | $8.00 | $32.00 | — | 75% | Apr 1, 2026 source file |
| Uchicago Medicine AdventHealth Hinsdale lowest Hinsdale, IL · (630) 856-9000 HC T4 FREE BY DIALYSIS - ARUP | $8.00 | $32.00 | — | 75% | Apr 1, 2026 source file |
| Uchicago Medicine AdventHealth Hinsdale lowest Hinsdale, IL · (630) 856-9000 HC T4 FREE - THYROXINE FREE | $8.00 | $32.00 | — | 75% | Apr 1, 2026 source file |
| Uchicago Medicine AdventHealth Hinsdale lowest Hinsdale, IL · (630) 856-9000 HC T4 FREE BY DIALYSIS - ARUP | $8.00 | $32.00 | — | 75% | Apr 1, 2026 source file |
| Uchicago Medicine AdventHealth Hinsdale lowest Hinsdale, IL · (630) 856-9000 HC T4 FREE - THYROXINE FREE | $8.00 | $32.00 | — | 75% | Apr 1, 2026 source file |
| Uchicago Medicine AdventHealth Bolingbrook lowest Bolingbrook, IL · (630) 312-5000 HC T4 FREE - THYROXINE FREE | $8.00 | $32.00 | — | 75% | Apr 1, 2026 source file |
| Uchicago Medicine AdventHealth Bolingbrook lowest Bolingbrook, IL · (630) 312-5000 HC T4 FREE BY DIALYSIS - ARUP | $8.00 | $32.00 | — | 75% | Apr 1, 2026 source file |
| Uchicago Medicine AdventHealth Bolingbrook lowest Bolingbrook, IL · (630) 312-5000 HC T4 FREE - THYROXINE FREE | $8.00 | $32.00 | — | 75% | Apr 1, 2026 source file |
| Uchicago Medicine AdventHealth Bolingbrook lowest Bolingbrook, IL · (630) 312-5000 HC T4 FREE BY DIALYSIS - ARUP | $8.00 | $32.00 | — | 75% | Apr 1, 2026 source file |
| Presence Saint Joseph Hospital - Chicago Chicago, IL · (773) 665-3000 HC T4 FREE DIRECT DIALYSIS | $34.98 | $106.00 | $9.02–$38.14 | 67% | — source file |
| Presence Saint Joseph Hospital - Chicago Chicago, IL · (773) 665-3000 HC FREE T4, SERUM | $34.98 | $106.00 | $9.02–$38.14 | 67% | — source file |
| La Rabida Children's Hospital|LaRabida Childrens Hospital Chicago, IL · (773) 363-6700 FREE T4 | $58.61 | $58.61 | — | — | Apr 1, 2026 source file |
| Advocate Trinity Hospital Chicago, IL · (773) 967-5002 T4, FREE | $65.00 | $130.00 | $56.81–$104.00 | 50% | Nov 4, 2025 source file |
| Advocate South Suburban Hospital Hazel Crest, IL T4, FREE | $65.00 | $130.00 | $56.81–$104.00 | 50% | Nov 4, 2025 source file |
| Advocate Christ Medical Center Oak Lawn, IL · (708) 684-8000 T4, FREE | $65.00 | $130.00 | $56.81–$104.00 | 50% | Nov 4, 2025 source file |
| Advocate Good Shepherd Hospital Barrington, IL · (847) 381-9600 T4, FREE | $65.00 | $130.00 | $56.81–$104.00 | 50% | Nov 4, 2025 source file |
| Advocate Condell Medical Center Libertyville, IL · (847) 362-2900 T4, FREE | $65.00 | $130.00 | $56.81–$104.00 | 50% | Nov 4, 2025 source file |
| Advocate Good Samaritan Hospital Downers Grove, IL · (630) 275-5900 T4, FREE | $65.00 | $130.00 | $56.81–$104.00 | 50% | Nov 4, 2025 source file |
| Advocate Childrens Hospital Park Ridge Park Ridge, IL T4, FREE | $65.00 | $130.00 | $56.81–$104.00 | 50% | Nov 4, 2025 source file |
| Advocate Childrens Hospital Oak Lawn Oak Lawn, IL T4, FREE | $65.00 | $130.00 | $56.81–$104.00 | 50% | Nov 4, 2025 source file |
| Advocate Sherman Hospital Elgin, IL · (847) 742-9800 T4, FREE | $65.00 | $130.00 | $56.81–$117.00 | 50% | Nov 4, 2025 source file |
| Advocate Lutheran General Hospital Park Ridge, IL · (847) 723-2210 T4, FREE | $65.00 | $130.00 | $56.81–$104.00 | 50% | Nov 4, 2025 source file |
| Advocate Illinois Masonic Medical Center Chicago, IL · (773) 975-1600 T4, FREE | $65.00 | $130.00 | $56.81–$104.00 | 50% | Nov 4, 2025 source file |
| The University of Chicago Medical Center Chicago, IL · (773) 702-9785 Hc Thyroxine, Free Index Additional-Laf | $85.00 | $85.00 | — | — | Apr 1, 2026 source file |
| The University of Chicago Medical Center Chicago, IL · (773) 702-9785 Hc Thyroxine, Fti-Laf | $85.00 | $85.00 | — | — | Apr 1, 2026 source file |
| Northwest Community Hospital Arlington Heights, IL · (847) 618-1000 Hb Assay Of Free Thyroxine | $85.00 | $85.00 | — | — | Apr 1, 2026 source file |
| The University of Chicago Medical Center Chicago, IL · (773) 702-9785 Hc Thyroxine, Free-Laf | $85.00 | $85.00 | — | — | Apr 1, 2026 source file |
| The University of Chicago Medical Center Chicago, IL · (773) 702-9785 Hc Final Free Thyroxine-Laf | $85.00 | $85.00 | — | — | Apr 1, 2026 source file |
| NorthShore University HealthSystems Skokie Hospital Skokie, IL R Thyroxine (T4); Free by Dialysis (P) | $115.05 | $177.00 | $28.85–$94.70 | 35% | — source file |
| NorthShore University HealthSystems Glenbrook Hospital Glenview, IL Thyroxine Free* | $115.05 | $177.00 | $28.85–$94.70 | 35% | — source file |
| NorthShore University HealthSystems Glenbrook Hospital Glenview, IL R Thyroxine (T4); Free by Dialysis (P) | $115.05 | $177.00 | $28.85–$94.70 | 35% | — source file |
| NorthShore University HealthSystems Highland Park Hospital Highland Park, IL Thyroxine Free* | $115.05 | $177.00 | $28.85–$94.70 | 35% | — source file |
| NorthShore University HealthSystems Highland Park Hospital Highland Park, IL R Thyroxine (T4); Free by Dialysis (P) | $115.05 | $177.00 | $28.85–$94.70 | 35% | — source file |
| NorthShore University HealthSystems Evanston Hospital Evanson, IL · (847) 570-2000 Thyroxine Free* | $115.05 | $177.00 | $28.85–$94.70 | 35% | — source file |
| NorthShore University HealthSystems Evanston Hospital Evanson, IL · (847) 570-2000 R Thyroxine (T4); Free by Dialysis (P) | $115.05 | $177.00 | $28.85–$94.70 | 35% | — source file |
| NorthShore University HealthSystems Skokie Hospital Skokie, IL Thyroxine Free* | $115.05 | $177.00 | $28.85–$94.70 | 35% | — source file |
| Resilience Healthcare West Suburban Medical Center Oak Park, IL · (708) 383-6200 Free T4 Level | $125.24 | $368.36 | $239.43 | 66% | Mar 17, 2025 source file |
| Resilience Healthcare West Suburban Medical Center Oak Park, IL · (708) 383-6200 Thyroxine (T4) Free Direct SO | $125.24 | $368.36 | $239.43 | 66% | Mar 17, 2025 source file |
| Resilience Healthcare West Suburban Medical Center Oak Park, IL · (708) 383-6200 TSH+Free T4 SO | $125.24 | $368.36 | $239.43 | 66% | Mar 17, 2025 source file |
| Resilience Healthcare West Suburban Medical Center Oak Park, IL · (708) 383-6200 84439 THYROXINE FREE | $125.24 | $368.36 | $239.43 | 66% | Mar 17, 2025 source file |
| Louis A Weiss Memorial Hospital Chicago, IL · (773) 878-8700 Free T4 Level | $145.95 | $429.27 | $279.03 | 66% | Mar 17, 2025 source file |
| Louis A Weiss Memorial Hospital Chicago, IL · (773) 878-8700 84439 THYROXINE FREE | $145.95 | $429.27 | $279.03 | 66% | Mar 17, 2025 source file |
| Louis A Weiss Memorial Hospital Chicago, IL · (773) 878-8700 Thyroxine (T4) Free Direct SO | $145.95 | $429.27 | $279.03 | 66% | Mar 17, 2025 source file |
| Louis A Weiss Memorial Hospital Chicago, IL · (773) 878-8700 TSH+Free T4 SO | $145.95 | $429.27 | $279.03 | 66% | Mar 17, 2025 source file |
| Elmhurst Memorial Hospital Elmhurst, IL · (331) 221-1000 HC THYROXINE FREE | $175.00 | $175.00 | — | — | Apr 1, 2026 source file |
| Edward Hospital Naperville, IL · (630) 527-3000 HC THYROXINE FREE | $175.00 | $175.00 | — | — | Apr 1, 2026 source file |
| Endeavor Health Clinical Operations Highland Park, IL HB R THYROXINE (T4); FREE BY DIALYSIS (P) | $177.00 | $177.00 | — | — | Apr 1, 2026 source file |
| Swedish Covenant Health Chicago, IL · (773) 878-8200 HB THYROXINE, FREE* | $177.00 | $177.00 | — | — | Apr 1, 2026 source file |
| Swedish Covenant Health Chicago, IL · (773) 878-8200 HB R THYROXINE (T4); FREE BY DIALYSIS (P) | $177.00 | $177.00 | — | — | Apr 1, 2026 source file |
| Endeavor Health Clinical Operations Highland Park, IL HB THYROXINE, FREE* | $177.00 | $177.00 | — | — | Apr 1, 2026 source file |
| Northshore University Healthsystem - Evanston Hospital Evanston, IL · (847) 570-2000 HB R THYROXINE (T4); FREE BY DIALYSIS (P) | $177.00 | $177.00 | — | — | Apr 1, 2026 source file |
| Northshore University Healthsystem - Evanston Hospital Evanston, IL · (847) 570-2000 HB THYROXINE, FREE* | $177.00 | $177.00 | — | — | Apr 1, 2026 source file |
| Ann & Robert H. Lurie Children's Hospital of Chicago Chicago, IL · (312) 227-4000 H THYROXINE FREE (FT4) SERUM | $201.60 | $288.00 | $106.56–$3,678.00 | 30% | — source file |
| Uchicago Medicine Northwest Indiana Crown Point, IN · (312) 755-4706 HC THYROXINE, FREE | $213.00 | $213.00 | — | — | Apr 1, 2026 source file |
| Ingalls Memorial Hospital Harvey, IL · (708) 333-2300 Hc Thyroxine, Free | $213.00 | $213.00 | — | — | Apr 1, 2026 source file |
| The University of Chicago Medical Center Chicago, IL · (773) 702-9785 Hc Final Free Thyroxine | $347.00 | $347.00 | — | — | Apr 1, 2026 source file |
| The University of Chicago Medical Center Chicago, IL · (773) 702-9785 Hc Thyroxine, Free | $347.00 | $347.00 | — | — | Apr 1, 2026 source file |
| The University of Chicago Medical Center Chicago, IL · (773) 702-9785 Hc Thyroxine, Free Index Additional | $347.00 | $347.00 | — | — | Apr 1, 2026 source file |
| The University of Chicago Medical Center Chicago, IL · (773) 702-9785 Hc Thyroxine, Fti | $347.00 | $347.00 | — | — | Apr 1, 2026 source file |
Inpatient: lowest $8.00, median $65.00, highest $213.00 — a 26.6× difference within the same market.
As an outpatient, the same code is billed by 51 facilities here, median $85.00 — that is the price to compare if you are not being admitted.
Cash or insurance?
At 15 of 19 hospitals that publish insurer rates for this code here, the cash price is below the highest rate a health plan has negotiated, and at 2 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 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.