Free T4 test cost in Los Angeles, CA — inpatient
In Los Angeles-Long Beach-Anaheim, CA, 29 hospitals list a cash price for free T4 (free thyroxine) thyroid blood test as an inpatient: from $7.23 to $159.60, with a median of $68.12. The lowest listed price is at Cedars-Sinai Medical Center — $60.89 less than the median here. Across California, the median is $68.12 at 104 hospitals.
Cash prices at 29 facilities across 20 cities for code 84439, as an inpatient (admitted to hospital) . Collected Sep 23, 2026; the hospital files themselves were last updated between Nov 26, 2025 and Jul 27, 2026.
Where each hospital's price falls
Each dot is one hospital's cash price on a scale from the lowest to the highest in Los Angeles-Long Beach-Anaheim, CA.
Hospitals, cheapest first
| Hospital | Cash price | List price | Insurers pay | Off list | File date |
|---|---|---|---|---|---|
| Cedars-Sinai Medical Center lowest Los Angeles, CA HB LAB FREE T4 | $7.23 | $11.13 | $13,270.00–$14,761.00 | 35% | Nov 26, 2025 source file |
| Cedars-Sinai Medical Center lowest Los Angeles, CA HB LAB FREE T4 BY DIALYSIS | $7.23 | $11.13 | $13,270.00–$14,761.00 | 35% | Nov 26, 2025 source file |
| Hoag Memorial Hospital Presbyterian Newport Beach, CA HC Free T4 by Dialysis | $7.51 | $11.55 | — | 35% | Apr 1, 2026 source file |
| Regents of the University of California at Irvine Hospital Orange, CA HB ASSAY OF FREE THYROXINE | $17.20 | $43.00 | — | 60% | Apr 1, 2026 source file |
| UCI Health - Fountain Valley Orange, CA THYROXINE FREE | $17.20 | $43.00 | — | 60% | Apr 1, 2026 source file |
| UCI Health - Los Alamitos Orange, CA THYROXINE FREE | $17.20 | $43.00 | — | 60% | Apr 1, 2026 source file |
| UCI Health - Placentia Linda Orange, CA THYROXINE FREE | $17.20 | $43.00 | — | 60% | Apr 1, 2026 source file |
| Regents of the University of California at Irvine Hospital Orange, CA HB LAB LABCORP ZET4F ASSAY OF FREE THYROXINE (UCI ONLY) | $22.00 | $55.00 | — | 60% | Apr 1, 2026 source file |
| St Jude Hospital Inc Fullerton, CA HC ASSAY OF FREE THYROXINE CDM | $52.56 | $109.50 | — | 52% | Apr 1, 2026 source file |
| Mission Hospital Regional Med Center Mission Viejo, CA HC ASSAY OF FREE THYROXINE CDM | $52.56 | $109.50 | — | 52% | Apr 1, 2026 source file |
| St Joseph Hospital of Orange Orange, CA HC ASSAY OF FREE THYROXINE CDM | $52.56 | $109.50 | — | 52% | Apr 1, 2026 source file |
| Kaiser Foundation Hospital - Los Angeles Los Angeles, CA ASSAY OF FREE THYROXINE | $68.12 | $131.00 | $7.00–$20.00 | 48% | — source file |
| Kaiser Foundation Hospital - Panorama City Panorama City, CA ASSAY OF FREE THYROXINE | $68.12 | $131.00 | $7.00–$20.00 | 48% | — source file |
| Kaiser Foundation Hospital - West la Los Angeles, CA ASSAY OF FREE THYROXINE | $68.12 | $131.00 | $7.00–$20.00 | 48% | — source file |
| Kaiser Foundation Hospital - Downey Downey, CA ASSAY OF FREE THYROXINE | $68.12 | $131.00 | $7.00–$20.00 | 48% | — source file |
| Kaiser Foundation Hospital - Orange County - Anaheim Anaheim, CA ASSAY OF FREE THYROXINE | $68.12 | $131.00 | $7.00–$20.00 | 48% | — source file |
| Kaiser Foundation Hospital - Baldwin Park Baldwin Park, CA ASSAY OF FREE THYROXINE | $68.12 | $131.00 | $7.00–$20.00 | 48% | — source file |
| Kaiser Foundation Hospital - Woodland Hills Woodland Hills, CA ASSAY OF FREE THYROXINE | $68.12 | $131.00 | $7.00–$20.00 | 48% | — source file |
| Kaiser Foundation Hospital - South Bay Harbor City, CA ASSAY OF FREE THYROXINE | $68.12 | $131.00 | $7.00–$20.00 | 48% | — source file |
| Kaiser Foundation Hospital - Orange County - Irvine Irvine, CA ASSAY OF FREE THYROXINE | $68.12 | $131.00 | $7.00–$20.00 | 48% | — source file |
| Providence Health System - Southern California San Pedro, CA HC ASSAY OF FREE THYROXINE CDM | $83.65 | $239.00 | — | 65% | Apr 1, 2026 source file |
| Providence Health System - Southern California San Pedro, CA HC ASSAY OF FREE THYROXINE LAB | $83.65 | $239.00 | — | 65% | Apr 1, 2026 source file |
| Providence Health System - Southern California San Pedro, CA HC THYROXINE FREE | $83.65 | $239.00 | — | 65% | Apr 1, 2026 source file |
| Providence Health System - Southern California Torrance, CA HC ASSAY OF FREE THYROXINE CDM | $83.65 | $239.00 | — | 65% | Apr 1, 2026 source file |
| Providence Health System - Southern California Torrance, CA HC ASSAY OF FREE THYROXINE LAB | $83.65 | $239.00 | — | 65% | Apr 1, 2026 source file |
| Providence Health System - Southern California Torrance, CA HC THYROXINE FREE | $83.65 | $239.00 | — | 65% | Apr 1, 2026 source file |
| USC Arcadia Hospital Arcadia, CA FREE T4 | $86.45 | $247.00 | $185.25–$247.00 | 65% | Jul 27, 2026 source file |
| Cedars-Sinai Marina Hospital Marina del Rey, CA HB LAB FREE T4 | $87.14 | $134.07 | $7,175.00–$9,712.00 | 35% | Nov 26, 2025 source file |
| Cedars-Sinai Marina Hospital Marina del Rey, CA HB THYROXINE FREE | $87.14 | $134.07 | $7,175.00–$9,712.00 | 35% | Nov 26, 2025 source file |
| Providence Health System - Southern California Mission Hills, CA HC ASSAY OF FREE THYROXINE CDM | $116.90 | $334.00 | — | 65% | Apr 1, 2026 source file |
| Providence Health System - Southern California Mission Hills, CA HC ASSAY OF FREE THYROXINE LAB | $116.90 | $334.00 | — | 65% | Apr 1, 2026 source file |
| Providence Health System - Southern California Mission Hills, CA HC THYROXINE FREE | $116.90 | $334.00 | — | 65% | Apr 1, 2026 source file |
| Providence Health System - Southern California Burbank, CA HC ASSAY OF FREE THYROXINE LAB | $121.80 | $348.00 | — | 65% | Apr 1, 2026 source file |
| Providence Health System - Southern California Burbank, CA HC THYROXINE FREE | $121.80 | $348.00 | — | 65% | Apr 1, 2026 source file |
| Providence Health System - Southern California Burbank, CA HC ASSAY OF FREE THYROXINE CDM | $121.80 | $348.00 | — | 65% | Apr 1, 2026 source file |
| Tarzana Medical Center LLC Tarzana, CA HC THYROXINE FREE | $122.85 | $351.00 | — | 65% | Apr 1, 2026 source file |
| Tarzana Medical Center LLC Tarzana, CA HC ASSAY OF FREE THYROXINE LAB | $122.85 | $351.00 | — | 65% | Apr 1, 2026 source file |
| Tarzana Medical Center LLC Tarzana, CA HC ASSAY OF FREE THYROXINE CDM | $122.85 | $351.00 | — | 65% | Apr 1, 2026 source file |
| USC Kenneth Norris Jr Cancer Hospital Los Angeles, CA Assay Of Free Thyroxine | $126.75 | $126.75 | — | — | Apr 1, 2026 source file |
| Providence Health System - Southern California Santa Monica, CA HC ASSAY OF FREE THYROXINE LAB | $140.35 | $401.00 | — | 65% | Apr 1, 2026 source file |
| Providence Health System - Southern California Santa Monica, CA HC ASSAY OF FREE THYROXINE CDM | $140.35 | $401.00 | — | 65% | Apr 1, 2026 source file |
| Keck Hospital of USC Los Angeles, CA Assay Of Free Thyroxine | $143.75 | $143.75 | — | — | Apr 1, 2026 source file |
| UCI Health - Lakewood Orange, CA THYROXINE FREE | $159.60 | $399.00 | — | 60% | Apr 1, 2026 source file |
Inpatient: lowest $7.23, median $68.12, highest $159.60 — a 22.1× difference within the same market.
As an outpatient, the same code is billed by 32 facilities here, median $52.56 — that is the price to compare if you are not being admitted.
Cash or insurance?
At 3 of 12 hospitals that publish insurer rates for this code here, the cash price is below the highest rate a health plan has negotiated, and at 3 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.
4 rows held back from this comparison
They are priced below $1 or below a tenth of the national median for code 84439 ($60.00). 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.
| Hoag Memorial Hospital Presbyterian Newport Beach, CAHC Free T4 | $3.25 | file |
| St Jude Hospital Inc Fullerton, CAHC ASSAY OF FREE THYROXINE LAB | $4.80 | file |
| St Joseph Hospital of Orange Orange, CAHC ASSAY OF FREE THYROXINE LAB | $4.80 | file |
| Mission Hospital Regional Med Center Mission Viejo, CAHC ASSAY OF FREE THYROXINE LAB | $4.80 | file |