Free T4 test cost in Chicago, IL
In Chicago-Naperville-Elgin, IL-IN, 63 hospitals list a cash price for free T4 (free thyroxine) thyroid blood test: from $8.00 to $312.90, with a median of $78.95. The lowest listed price is at Uchicago Medicine AdventHealth La Grange and 3 other hospitals — $70.95 less than the median here. Across Illinois, the median is $115.77 at 117 hospitals.
- The median here, $78.95, is 19% above the US median of $66.50.
- That is 8.8× Medicare's 2026 national rate for the same service ($9.02).
- 12 of 63 hospitals list a cash price equal to their full list price, with no self-pay discount.
Cash prices at 63 facilities across 44 cities for code 84439, as an outpatient — the setting a self-pay patient normally buys. Collected Nov 10, 2026; the hospital files themselves were last updated between Jan 1, 2025 and Nov 6, 2026.
Lowest$8.00Uchicago Medicine AdventHealth La Grange + 3 more
Median$78.95half of hospitals charge less
Highest$312.90in this market
Difference39.1×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 |
|---|---|---|---|---|
| Uchicago Medicine AdventHealth La Grange lowest La Grange, IL · (708) 352-1200 HC T4 FREE - THYROXINE FREE+1 more line at this price File of Apr 1, 2026 · source file | $8.00 | $32.00 | — | 75% |
| Uchicago Medicine AdventHealth Hinsdale lowest Hinsdale, IL · (630) 856-9000 HC T4 FREE BY DIALYSIS - ARUP+1 more line at this price File of Apr 1, 2026 · source file | $8.00 | $32.00 | — | 75% |
| Uchicago Medicine AdventHealth Bolingbrook lowest Bolingbrook, IL · (630) 312-5000 HC T4 FREE - THYROXINE FREE+1 more line at this price File of Apr 1, 2026 · source file | $8.00 | $32.00 | — | 75% |
| Uchicago Medicine AdventHealth Glenoaks lowest Glendale Heights, IL · (630) 545-8000 HC T4 FREE BY DIALYSIS - ARUP+1 more line at this price File of Apr 1, 2026 · source file | $8.00 | $32.00 | — | 75% |
| Saint Francis Hospital Evanston, IL · (847) 316-4000 HC ASSAY OF FREE THYROXINE File of Sep 1, 2026 · source file | $9.00 | $106.00 | $5.41–$106.00 | 92% |
| Saint Joseph Medical Center - Joliet Joliet, IL · (815) 725-7133 T4F REFLEX CASCADE CHARGE+2 more lines at this price File of Sep 1, 2026 · source file | $9.00 | $31.00 | $5.41–$388.00 | 71% |
| Mercy Medical Center Aurora, IL · (630) 859-2222 T4 (THYROXINE), FREE+1 more line at this price File of Sep 1, 2026 · source file | $9.00 | $256.00 | $5.41–$256.00 | 96% |
| Roseland Community Hospital Chicago, IL · (773) 995-3000 Thyroxine (thyroid chemical), free File of Jul 1, 2026 · source file | $13.43 | $45.00 | $8.39–$49.50 | 70% |
| John H. Stroger, Jr. Hospital Chicago, IL · (312) 864-6000 THYROXINE (T-4) FREE File of Apr 1, 2026 · source file | $16.10 | $23.00 | $2.53–$18.40 | 30% |
| MacNeal Hospital Berwyn, IL · (708) 783-9100 Free T4 (Qfrt4d) File of Mar 31, 2026 · source file | $19.00 | $100.00 | $1.55–$12.26 | 81% |
| Gottlieb Memorial Hospital Melrose Park, IL · (708) 681-3200 Free T4 (Qfrt4d) File of Mar 31, 2026 · source file | $19.00 | $100.00 | $42.60–$83.80 | 81% |
| Loyola University Medical Center Maywood, IL · (708) 216-9000 Free T4 (Qfrt4d) File of Mar 31, 2026 · source file | $23.00 | $100.00 | $50.00–$105.40 | 77% |
| Presence Saint Joseph Hospital - Chicago Chicago, IL · (773) 665-3000 HC T4 FREE DIRECT DIALYSIS+3 more lines at this price File of Jan 1, 2026 · source file | $34.98 | $106.00 | $9.02–$38.14 | 67% |
| Franciscan Health Munster Munster, IN · (219) 922-4200 Free Thyroxine 395 File of Jan 1, 2026 · source file | $36.21 | $170.00 | $7.13–$127.50 | 79% |
| Gottlieb Memorial Hospital Melrose Park, IL · (708) 681-3200 Thyroxin Free File of Mar 31, 2026 · source file | $36.67 | $193.00 | $82.22–$161.73 | 81% |
| MacNeal Hospital Berwyn, IL · (708) 783-9100 Thyroxin Free File of Mar 31, 2026 · source file | $36.67 | $193.00 | $36.67–$267.31 | 81% |
| Loyola University Medical Center Maywood, IL · (708) 216-9000 Thyroxin Free File of Mar 31, 2026 · source file | $44.39 | $193.00 | $96.50–$203.42 | 77% |
| La Rabida Children's Hospital Chicago, IL · (773) 363-6700 FREE T4 File of Apr 1, 2026 · source file | $58.61 | $58.61 | — | — |
| Advocate Sherman Hospital Elgin, IL · (847) 742-9800 T4, FREE File of Nov 3, 2026 · source file | $67.50 | $135.00 | $8.02–$121.50 | 50% |
| Advocate Childrens Hospital Park Ridge Park Ridge, IL T4, FREE File of Nov 6, 2026 · source file | $67.50 | $135.00 | $8.02–$120.15 | 50% |
| Advocate Good Samaritan Hospital Downers Grove, IL · (630) 275-5900 T4, FREE File of Nov 3, 2026 · source file | $67.50 | $135.00 | $8.02–$108.00 | 50% |
| Advocate Illinois Masonic Medical Center Chicago, IL · (773) 975-1600 T4, FREE File of Nov 3, 2026 · source file | $67.50 | $135.00 | $8.02–$109.89 | 50% |
| Advocate Childrens Hospital Oak Lawn Oak Lawn, IL T4, FREE File of Nov 3, 2026 · source file | $67.50 | $135.00 | $8.02–$108.00 | 50% |
| Advocate Condell Medical Center Libertyville, IL · (847) 362-2900 T4, FREE File of Nov 3, 2026 · source file | $67.50 | $135.00 | $8.02–$108.00 | 50% |
| Advocate South Suburban Hospital Hazel Crest, IL T4, FREE File of Nov 3, 2026 · source file | $67.50 | $135.00 | $8.02–$131.49 | 50% |
| Advocate Christ Medical Center Oak Lawn, IL · (708) 684-8000 T4, FREE File of Nov 3, 2026 · source file | $67.50 | $135.00 | $8.02–$108.00 | 50% |
| Advocate Lutheran General Hospital Park Ridge, IL · (847) 723-2210 T4, FREE File of Nov 3, 2026 · source file | $67.50 | $135.00 | $8.02–$120.15 | 50% |
| Advocate Good Shepherd Hospital Barrington, IL · (847) 381-9600 T4, FREE File of Nov 3, 2026 · source file | $67.50 | $135.00 | $8.02–$108.00 | 50% |
| Advocate Trinity Hospital Chicago, IL · (773) 967-5002 T4, FREE File of Nov 3, 2026 · source file | $67.50 | $135.00 | $8.02–$108.00 | 50% |
| Morris Hospital Morris, IL · (815) 942-2932 Thyroxine (thyroid chemical), free File of Oct 27, 2026 · source file | $71.46 | $297.00 | $128.30–$305.91 | 76% |
| Franciscan Health Rensselaer Rensselaer, IN · (219) 866-5141 Free Thyroxine 395 File of Jan 1, 2026 · source file | $74.46 | $208.00 | $8.07–$166.40 | 64% |
| Humboldt Park Health Chicago, IL · (773) 292-8200 Thyroxine (thyroid chemical), free File of Sep 29, 2026 · source file | $74.97 | $267.75 | $88.36–$281.14 | 72% |
| Shriners Childrens - Chicago Chicago, IL · (773) 622-5400 THYROXINE (THYROID CHEMICAL); FREE File of Mar 19, 2026 · source file | $77.40 | $77.40 | $8.02–$16.83 | — |
| Franciscan Health Dyer Dyer, IN · (219) 865-2141 Free Thyroxine 395 File of Jan 1, 2026 · source file | $78.30 | $290.00 | $8.07–$217.50 | 73% |
| Franciscan Health Crown Point Crown Point, IN · (219) 757-6100 Free Thyroxine 395 File of Jan 1, 2026 · source file | $78.95 | $306.00 | $306.00 | 74% |
| Northwest Community Hospital Arlington Heights, IL · (847) 618-1000 Hb Assay Of Free Thyroxine File of Apr 1, 2026 · source file | $85.00 | $85.00 | — | — |
| The University of Chicago Medical Center Chicago, IL · (773) 702-9785 Hc Final Free Thyroxine-Laf+3 more lines at this price File of Apr 1, 2026 · source file | $85.00 | $85.00 | — | — |
| Community First Medical Center Chicago, IL · (773) 282-7000 Thyroxine (thyroid chemical), free File of Apr 1, 2026 · source file | $96.38 | $192.75 | $9.02–$192.75 | 50% |
| NorthShore University HealthSystems Skokie Hospital Skokie, IL R Thyroxine (T4); Free by Dialysis (P)+1 more line at this price File of Jan 1, 2025 · source file | $115.05 | $177.00 | $23.90–$96.64 | 35% |
| NorthShore University HealthSystems Glenbrook Hospital Glenview, IL R Thyroxine (T4); Free by Dialysis (P)+1 more line at this price File of Jan 1, 2025 · source file | $115.05 | $177.00 | $23.90–$96.64 | 35% |
| Northwestern Medicine McHenry Hospital McHenry, IL · (815) 344-5000 HB Ref Free T4 (Gva)+4 more lines at this price File of Apr 1, 2026 · source file | $121.10 | $173.00 | $33.39–$173.00 | 30% |
| Northwestern Medicine Central DuPage Hospital Winfield, IL · (630) 682-1600 HB Ref Free T4 (Gva)+4 more lines at this price File of Apr 1, 2026 · source file | $121.10 | $173.00 | $11.94–$173.00 | 30% |
| Northwestern Lake Forest Hospital Lake Forest, IL · (847) 234-5600 HB Ref T4, Free (Lc)+4 more lines at this price File of Apr 1, 2026 · source file | $121.10 | $173.00 | $28.72–$173.00 | 30% |
| Northwestern Memorial Hospital Chicago, IL · (312) 926-2000 HB Ref Thyroxine, Free, Direct Dialysis (Mayo)+4 more lines at this price File of Apr 1, 2026 · source file | $121.10 | $173.00 | $33.56–$173.00 | 30% |
| Northwestern Medicine Valley West Hospital Sandwich, IL · (815) 786-8484 HB Ref T4, Free (Lc)+4 more lines at this price File of Apr 1, 2026 · source file | $121.10 | $173.00 | $32.87–$173.00 | 30% |
| Northwestern Medicine Delnor Hospital Geneva, IL · (630) 208-3000 HB T4, Free+4 more lines at this price File of Apr 1, 2026 · source file | $121.10 | $173.00 | $25.78–$173.00 | 30% |
| Palos Community Hospital Palos Heights, IL · (708) 923-4000 HB Ref Thyroxine, Free, Direct Dialysis (Mayo)+4 more lines at this price File of Apr 1, 2026 · source file | $121.10 | $173.00 | $27.68–$173.00 | 30% |
| Northwestern Medicine Kishwaukee Hospital DeKalb, IL · (815) 756-1521 HB Ref T4, Free (Lc)+4 more lines at this price File of Apr 1, 2026 · source file | $121.10 | $173.00 | $31.66–$173.00 | 30% |
| Mercyhealth Crystal Lake Hospital & Medical Center Crystal Lake, IL · (792) 220-5500 CHG ASSAY OF FREE THYROXINE File of Mar 1, 2026 · source file | $124.86 | $166.48 | — | 25% |
| Resilience Healthcare West Suburban Medical Center Oak Park, IL · (708) 383-6200 Free T4 Level+3 more lines at this price File of Mar 17, 2025 · source file | $125.24 | $368.36 | $7.23–$239.43 | 66% |
| Mercyhealth Hospital & Medical Center - Harvard Harvard, IL · (815) 943-5431 CHG ASSAY OF FREE THYROXINE File of Mar 1, 2026 · source file | $135.75 | $181.00 | — | 25% |
| Louis A Weiss Memorial Hospital Chicago, IL · (773) 878-8700 TSH+Free T4 SO+3 more lines at this price File of Mar 17, 2025 · source file | $145.95 | $429.27 | $7.23–$279.03 | 66% |
| Loretto Hospital Chicago, IL · (773) 626-4300 THYROXINE, FREE T4 File of Nov 5, 2026 · source file | $153.00 | $255.00 | $153.00–$255.00 | 40% |
| Jackson Park Hospital Foundation Chicago, IL · (773) 947-7500 T4 FREE File of Dec 26, 2025 · source file | $160.51 | $200.64 | — | 20% |
| Northwest Health - Porter Valparaiso, IN · (219) 983-8300 Thyroxine 4 Free Direct Dialysis (CQ)+2 more lines at this price File of Apr 1, 2026 · source file | $162.00 | $600.00 | $7.96–$504.00 | 73% |
| Edward Hospital Naperville, IL · (630) 527-3000 HC THYROXINE FREE File of Apr 1, 2026 · source file | $175.00 | $175.00 | — | — |
| Elmhurst Memorial Hospital Elmhurst, IL · (331) 221-1000 HC THYROXINE FREE File of Apr 1, 2026 · source file | $175.00 | $175.00 | — | — |
| Swedish Covenant Health Chicago, IL · (773) 878-8200 HB THYROXINE, FREE*+1 more line at this price File of Apr 1, 2026 · source file | $177.00 | $177.00 | — | — |
| Northshore University Healthsystem - Evanston Hospital Evanston, IL · (847) 570-2000 HB R THYROXINE (T4); FREE BY DIALYSIS (P)+1 more line at this price File of Apr 1, 2026 · source file | $177.00 | $177.00 | — | — |
| Endeavor Health Highland Park Hospital Highland Park, IL HB THYROXINE, FREE*+1 more line at this price File of Apr 1, 2026 · source file | $177.00 | $177.00 | — | — |
| Ann & Robert H. Lurie Children's Hospital of Chicago Chicago, IL · (312) 227-4000 H THYROXINE FREE (FT4) SERUM File of Sep 1, 2026 · source file | $201.60 | $288.00 | $48.96–$273.60 | 30% |
| Uchicago Medicine Northwest Indiana Crown Point, IN · (312) 755-4706 HC THYROXINE, FREE File of Apr 1, 2026 · source file | $213.00 | $213.00 | — | — |
| Ingalls Memorial Hospital Harvey, IL · (708) 333-2300 Hc Thyroxine, Free File of Apr 1, 2026 · source file | $213.00 | $213.00 | — | — |
| Vista Medical Center East Waukegan, IL · (847) 360-3000 THYROXINE T4, FREE File of Mar 31, 2025 · source file | $292.22 | $292.22 | $9.02–$41.20 | — |
| The Methodist Hospitals Gary, IN · (219) 886-4000 Free T4 File of Aug 18, 2026 · source file | $312.90 | $447.00 | $9.02–$397.83 | 30% |
| Methodist Hospital-Southlake Merrillville, IN · (219) 886-4000 Free T4 File of Aug 18, 2026 · source file | $312.90 | $447.00 | $9.02–$397.83 | 30% |
| The University of Chicago Medical Center Chicago, IL · (773) 702-9785 Hc Thyroxine, Free Index Additional+3 more lines at this price File of Apr 1, 2026 · source file | $347.00 | $347.00 | — | — |
Hospital The hospital that published the price, its city and the line exactly as written in its price file.
Cash price The hospital's own price for a patient paying without insurance (“discounted cash” in its price file). Hospitals must publish it under federal law, 45 CFR 180.50. Call to confirm it before booking. More
List price The hospital's full chargemaster price (“gross charge”) before any discount. Almost nobody pays it; the gap to the cash price shows what the self-pay discount is worth. More
Insurers pay The lowest and highest rates this hospital has agreed with insurance plans for the same item, from its price file. If the cash price is below what your plan pays and you have not met your deductible, paying cash can cost you less. More
Off list How much lower the cash price is than the list price.
No cash discount This line's cash price equals the hospital's full list price. Many hospitals still reduce bills for uninsured patients: ask the billing office for its self-pay discount in writing. More
Outpatient: lowest $8.00, median $78.95, highest $312.90 — a 39.1× difference within the same market.
As an inpatient, the same code is billed by 41 facilities here, median $78.30. Inpatient and outpatient prices are not comparable and are kept on separate pages: the inpatient charge covers admission, not the same purchase.
Cash or insurance?
At 41 of 46 hospitals that publish insurer rates for this code here, the cash price is below the highest rate a health plan has negotiated, and at 5 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 free T4 test is, what the price covers and why prices differ: Free T4 test explained.
2 rows held back from this comparison
They are priced below $1 or below a tenth of the national median for code 84439 ($57.00). Such a line is almost always a physician's fee billed separately, an assistant's share or a placeholder — a real charge, but not the price of the procedure itself.
| Hospital | Cash price | File |
|---|---|---|
| Loyola University Medical Center Maywood, ILEwc - Lab Free T4 | $0.01 | file |
| Gottlieb Memorial Hospital Melrose Park, ILEwc - Lab Free T4 | $0.01 | file |
File Link to the hospital's own price file.