Lab tests CPT 84439 California Outpatient

Free T4 test cost in California

In California, 104 hospitals publish a cash price for Free T4 (free thyroxine) thyroid blood test: from $6.84 to $487.62, with a median of $68.12. The lowest price is at Riverside University Medical Center (Moreno Valley). The highest price is 71.3× 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 24, 2026.

Lowest$6.84Riverside University Medical Center

Median$68.12half pay less

Highest$487.62in California

Lowest saves$61.28vs the median

Hospitals in California, cheapest first

Hospital	Cash price	List price	File date
Riverside University Medical Center lowest Moreno Valley · Riverside-San Bernardino-Ontario, CA HC Lab Ref Free T4 Index to T7	$6.84	$6.84	— source file
Cedars-Sinai Medical Center Los Angeles · Los Angeles-Long Beach-Anaheim, CA HB LAB FREE T4 BY DIALYSIS	$7.23	$11.13	Nov 26, 2025 source file
Hoag Memorial Hospital Presbyterian Newport Beach · Los Angeles-Long Beach-Anaheim, CA HC Free T4 by Dialysis	$7.51	$11.55	Apr 1, 2026 source file
Centinela Hospital Medical Center Inglewood · Los Angeles-Long Beach-Anaheim, CA THYROXINE FREE	$9.00	$442.00	Sep 1, 2026 source file
Chino Valley Medical Center Chino · Riverside-San Bernardino-Ontario, CA Hc Assay Of Free Thyroxine	$9.00	$341.48	Sep 1, 2026 source file
Desert Valley Hospital Victorville · Riverside-San Bernardino-Ontario, CA THYROXINE (T-4) FREE	$9.00	$172.00	Sep 1, 2026 source file
Encino Hospital Medical Center Encino · Los Angeles-Long Beach-Anaheim, CA LC 001974THYROX(T4)FR, DIR, S	$9.00	$5.00	Sep 1, 2026 source file
La Palma Intercommunity Hospital La Palma · Los Angeles-Long Beach-Anaheim, CA Hc Assay Of Free Thyroxine	$9.00	$328.31	Sep 1, 2026 source file
Montclair Hospital Medical Center Montclair · Riverside-San Bernardino-Ontario, CA Hc Assay Of Free Thyroxine	$9.00	$341.48	Sep 1, 2026 source file
Paradise Valley Hospital National City · San Diego-Chula Vista-Carlsbad, CA THYROXINE FREE	$9.00	$122.43	Sep 1, 2026 source file
Shasta Regional Medical Center Redding · Redding, CA T4 FREE MR	$9.00	$12.60	Sep 1, 2026 source file
Sherman Oaks Hospital Sherman Oaks · Los Angeles-Long Beach-Anaheim, CA T4 FREE	$9.00	$200.00	Sep 1, 2026 source file
Banner Lassen Medical Center Susanville · Susanville, CA LAB THYROXINE T4 FREE NS	$10.02	$16.00	Feb 12, 2026 source file
Stanford Health Care Stanford · San Jose-Sunnyvale-Santa Clara, CA HC 6959 Free T4 Equilib Dialysis	$10.80	$27.00	Apr 1, 2026 source file
Stanford Health Care Tri-Valley Pleasanton · San Francisco-Oakland-Fremont, CA HC 6959 Free T4 Equilib Dialysis	$10.80	$27.00	Apr 1, 2026 source file
UC San Diego Medical Center San Diego · San Diego-Chula Vista-Carlsbad, CA Thyroxine (thyroid chemical) measurement	$13.20	$24.00	Apr 1, 2026 source file
Lucile Salter Packard Children's Hospital at Stanford Palo Alto · San Jose-Sunnyvale-Santa Clara, CA HC 100 Free T4 Equilib Dialysis	$13.50	$27.00	Mar 31, 2026 source file
UCI Health - Fountain Valley Orange · Los Angeles-Long Beach-Anaheim, CA THYROXINE FREE	$17.20	$43.00	Apr 1, 2026 source file
UCI Health - Los Alamitos Orange · Los Angeles-Long Beach-Anaheim, CA THYROXINE FREE	$17.20	$43.00	Apr 1, 2026 source file
UCI Health - Placentia Linda Orange · Los Angeles-Long Beach-Anaheim, CA THYROXINE FREE	$17.20	$43.00	Apr 1, 2026 source file
Providence Health System - Southern California Burbank · Los Angeles-Long Beach-Anaheim, CA HC THYROXINE FREE	$22.05	$63.00	Apr 1, 2026 source file
Fresno Community Hospital and Medical Center Fresno · Fresno, CA THYROXINE FREE FTI;Q	$22.32	$27.90	Jun 18, 2026 source file
Fresno Community Hospital and Medical Center Clovis · Fresno, CA THYROXINE FREE FTI;Q	$22.32	$27.90	Jun 15, 2026 source file
Grossmont Hospital Corporation La Mesa · San Diego-Chula Vista-Carlsbad, CA HC FREE THYROXIN EQUILIB DIA	$24.03	$32.04	— source file
Sharp Chula Vista Medical Center Chula Vista · San Diego-Chula Vista-Carlsbad, CA HC FREE THYROXIN EQUILIB DIA	$24.03	$32.04	— source file
Sharp Coronado Hospital and Healthcare Center Coronado · San Diego-Chula Vista-Carlsbad, CA HC FREE THYROXIN EQUILIB DIA	$24.03	$32.04	— source file
Sharp Memorial Hospital San Diego · San Diego-Chula Vista-Carlsbad, CA HC FREE THYROXIN EQUILIB DIA	$24.03	$32.04	— source file
Loma Linda University Behavioral Medicine Center Redlands · Riverside-San Bernardino-Ontario, CA HC SOM THYROXINE (T4), FREE	$29.39	$29.39	Aug 31, 2026 source file
Loma Linda University Childrens Hospital Loma Linda · Riverside-San Bernardino-Ontario, CA HC SOM THYROXINE (T4), FREE	$29.39	$29.39	Sep 2, 2026 source file
Loma Linda University Medical Center Loma Linda · Riverside-San Bernardino-Ontario, CA HC SOM THYROXINE (T4), FREE	$29.39	$29.39	Sep 2, 2026 source file
Loma Linda University Medical Center - Murrieta Murrieta · Riverside-San Bernardino-Ontario, CA HC SOM THYROXINE (T4), FREE	$29.39	$29.39	Sep 2, 2026 source file
Mission Hospital Regional Med Center Mission Viejo · Los Angeles-Long Beach-Anaheim, CA HC ASSAY OF FREE THYROXINE CDM	$37.92	$79.00	Apr 1, 2026 source file
Providence Health System - Southern California Santa Monica · Los Angeles-Long Beach-Anaheim, CA HC ASSAY OF FREE THYROXINE CDM	$42.35	$121.00	Apr 1, 2026 source file
Ridgecrest Regional Hospital Ridgecrest · Bakersfield-Delano, CA Assay of free thyroxine	$42.90	$80.95	Sep 11, 2026 source file
El Camino Hospital Mountain View · San Jose-Sunnyvale-Santa Clara, CA HC FREE T4	$43.00	$172.00	Apr 1, 2026 source file
Chinese Hospital Association San Francisco · San Francisco-Oakland-Fremont, CA Thyroxine (thyroid chemical), free	$46.00	$46.00	Jul 22, 2026 source file
Tarzana Medical Center LLC Tarzana · Los Angeles-Long Beach-Anaheim, CA HC ASSAY OF FREE THYROXINE LAB	$47.25	$135.00	Apr 1, 2026 source file
Providence Health System - Southern California San Pedro · Los Angeles-Long Beach-Anaheim, CA HC ASSAY OF FREE THYROXINE CDM	$51.10	$146.00	Apr 1, 2026 source file
Providence Health System - Southern California Torrance · Los Angeles-Long Beach-Anaheim, CA HC ASSAY OF FREE THYROXINE LAB	$51.10	$146.00	Apr 1, 2026 source file
St Joseph Hospital of Orange Orange · Los Angeles-Long Beach-Anaheim, CA HC ASSAY OF FREE THYROXINE CDM	$52.56	$109.50	Apr 1, 2026 source file
St Jude Hospital Inc Fullerton · Los Angeles-Long Beach-Anaheim, CA HC ASSAY OF FREE THYROXINE CDM	$52.56	$109.50	Apr 1, 2026 source file
St Mary Medical Center Apple Valley · Riverside-San Bernardino-Ontario, CA HC ASSAY OF FREE THYROXINE CDM	$52.56	$109.50	Apr 1, 2026 source file
NorCal HealthConnect LLC Petaluma · Santa Rosa-Petaluma, CA HC ASSAY OF FREE THYROXINE CDM	$55.85	$109.50	Apr 1, 2026 source file
St Joseph Health Northern California LLC Napa · Napa, CA HC ASSAY OF FREE THYROXINE CDM	$55.85	$109.50	Apr 1, 2026 source file
St Joseph Health Northern California LLC Fortuna · Eureka-Arcata, CA HC ASSAY OF FREE THYROXINE CDM	$55.85	$109.50	Apr 1, 2026 source file
St Joseph Health Northern California LLC Santa Rosa · Santa Rosa-Petaluma, CA HC ASSAY OF FREE THYROXINE CDM	$55.85	$109.50	Apr 1, 2026 source file
St Joseph Health Northern California LLC Eureka · Eureka-Arcata, CA HC ASSAY OF FREE THYROXINE CDM	$55.85	$109.50	Apr 1, 2026 source file
NorCal HealthConnect LLC Healdsburg · Santa Rosa-Petaluma, CA HC ASSAY OF FREE THYROXINE CDM	$56.61	$111.00	Apr 1, 2026 source file
Rady Children's Hospital - San Diego San Diego · San Diego-Chula Vista-Carlsbad, CA Rch Scren-Free T4 Eia	$60.00	$80.00	Apr 1, 2026 source file
Kaiser Foundation Hospital - Baldwin Park Baldwin Park · Los Angeles-Long Beach-Anaheim, CA ASSAY OF FREE THYROXINE	$68.12	$131.00	— source file
Kaiser Foundation Hospital - Downey Downey · Los Angeles-Long Beach-Anaheim, CA ASSAY OF FREE THYROXINE	$68.12	$131.00	— source file
Kaiser Foundation Hospital - Fontana Fontana · Riverside-San Bernardino-Ontario, CA ASSAY OF FREE THYROXINE	$68.12	$131.00	— source file
Kaiser Foundation Hospital - Los Angeles Los Angeles · Los Angeles-Long Beach-Anaheim, CA ASSAY OF FREE THYROXINE	$68.12	$131.00	— source file
Kaiser Foundation Hospital - Moreno Valley Moreno Valley · Riverside-San Bernardino-Ontario, CA ASSAY OF FREE THYROXINE	$68.12	$131.00	— source file
Kaiser Foundation Hospital - Ontario Ontario · Ontario, CA ASSAY OF FREE THYROXINE	$68.12	$131.00	— source file
Kaiser Foundation Hospital - Orange County - Anaheim Anaheim · Los Angeles-Long Beach-Anaheim, CA ASSAY OF FREE THYROXINE	$68.12	$131.00	— source file
Kaiser Foundation Hospital - Orange County - Irvine Irvine · Los Angeles-Long Beach-Anaheim, CA ASSAY OF FREE THYROXINE	$68.12	$131.00	— source file
Kaiser Foundation Hospital - Panorama City Panorama City · Los Angeles-Long Beach-Anaheim, CA ASSAY OF FREE THYROXINE	$68.12	$131.00	— source file
Kaiser Foundation Hospital - Riverside Riverside · Riverside-San Bernardino-Ontario, CA ASSAY OF FREE THYROXINE	$68.12	$131.00	— source file
Kaiser Foundation Hospital - San Diego - Clairemont Mesa San Diego · San Diego-Chula Vista-Carlsbad, CA ASSAY OF FREE THYROXINE	$68.12	$131.00	— source file
Kaiser Foundation Hospital - San Diego - Zion San Diego · San Diego-Chula Vista-Carlsbad, CA ASSAY OF FREE THYROXINE	$68.12	$131.00	— source file
Kaiser Foundation Hospital - San Marcos San Marcos · San Diego-Chula Vista-Carlsbad, CA ASSAY OF FREE THYROXINE	$68.12	$131.00	— source file
Kaiser Foundation Hospital - South Bay Harbor City · Los Angeles-Long Beach-Anaheim, CA ASSAY OF FREE THYROXINE	$68.12	$131.00	— source file
Kaiser Foundation Hospital - West la Los Angeles · Los Angeles-Long Beach-Anaheim, CA ASSAY OF FREE THYROXINE	$68.12	$131.00	— source file
Kaiser Foundation Hospital - Woodland Hills Woodland Hills · Los Angeles-Long Beach-Anaheim, CA ASSAY OF FREE THYROXINE	$68.12	$131.00	— source file
Hayward Sisters Hospital Hayward · San Francisco-Oakland-Fremont, CA T4FREE	$77.49	$258.30	Feb 23, 2026 source file
USC Arcadia Hospital Arcadia · Los Angeles-Long Beach-Anaheim, CA FREE T4	$86.45	$247.00	Jul 27, 2026 source file
Cedars-Sinai Marina Hospital Marina del Rey · Los Angeles-Long Beach-Anaheim, CA Laboratory Services	$87.14	$134.07	Nov 26, 2025 source file
Shriners Childrens - Northern California Sacramento · Sacramento-Roseville-Folsom, CA THYROXINE (THYROID CHEMICAL); FREE	$93.80	$93.80	— source file
Kaiser Foundation Hospital & Rehab Center - Vallejo Vallejo · Vallejo, CA ASSAY OF FREE THYROXINE	$102.48	$183.00	— source file
Kaiser Foundation Hospital - Antioch Antioch · San Francisco-Oakland-Fremont, CA ASSAY OF FREE THYROXINE	$102.48	$183.00	— source file
Kaiser Foundation Hospital - Fremont Fremont · San Francisco-Oakland-Fremont, CA ASSAY OF FREE THYROXINE	$102.48	$183.00	— source file
Kaiser Foundation Hospital - Fresno Fresno · Fresno, CA ASSAY OF FREE THYROXINE	$102.48	$183.00	— source file
Kaiser Foundation Hospital - Manteca Manteca · Stockton-Lodi, CA ASSAY OF FREE THYROXINE	$102.48	$183.00	— source file
Kaiser Foundation Hospital - Modesto Modesto · Modesto, CA ASSAY OF FREE THYROXINE	$102.48	$183.00	— source file
Kaiser Foundation Hospital - Oakland/Richmond Oakland · San Francisco-Oakland-Fremont, CA ASSAY OF FREE THYROXINE	$102.48	$183.00	— source file
Kaiser Foundation Hospital - Redwood City Redwood City · San Francisco-Oakland-Fremont, CA ASSAY OF FREE THYROXINE	$102.48	$183.00	— source file
Kaiser Foundation Hospital - Richmond Campus Richmond · Richmond, CA ASSAY OF FREE THYROXINE	$102.48	$183.00	— source file
Kaiser Foundation Hospital - Roseville Roseville · Sacramento-Roseville-Folsom, CA ASSAY OF FREE THYROXINE	$102.48	$183.00	— source file
Kaiser Foundation Hospital - Sacramento Sacramento · Sacramento-Roseville-Folsom, CA ASSAY OF FREE THYROXINE	$102.48	$183.00	— source file
Kaiser Foundation Hospital - San Francisco San Francisco · San Francisco-Oakland-Fremont, CA ASSAY OF FREE THYROXINE	$102.48	$183.00	— source file
Kaiser Foundation Hospital - San Jose San Jose · San Jose-Sunnyvale-Santa Clara, CA ASSAY OF FREE THYROXINE	$102.48	$183.00	— source file
Kaiser Foundation Hospital - San Leandro San Leandro · San Francisco-Oakland-Fremont, CA ASSAY OF FREE THYROXINE	$102.48	$183.00	— source file
Kaiser Foundation Hospital - San Rafael San Rafael · San Francisco-Oakland-Fremont, CA ASSAY OF FREE THYROXINE	$102.48	$183.00	— source file
Kaiser Foundation Hospital - Santa Clara Santa Clara · San Jose-Sunnyvale-Santa Clara, CA ASSAY OF FREE THYROXINE	$102.48	$183.00	— source file
Kaiser Foundation Hospital - Santa Rosa Santa Rosa · Santa Rosa-Petaluma, CA ASSAY OF FREE THYROXINE	$102.48	$183.00	— source file
Kaiser Foundation Hospital - South Sacramento Sacramento · Sacramento-Roseville-Folsom, CA ASSAY OF FREE THYROXINE	$102.48	$183.00	— source file
Kaiser Foundation Hospital - South San Francisco South San Francisco · San Francisco-Oakland-Fremont, CA ASSAY OF FREE THYROXINE	$102.48	$183.00	— source file
Kaiser Foundation Hospital - Vacaville Vacaville · Vallejo, CA ASSAY OF FREE THYROXINE	$102.48	$183.00	— source file
Kaiser Foundation Hospital - Walnut Creek Walnut Creek · San Francisco-Oakland-Fremont, CA ASSAY OF FREE THYROXINE	$102.48	$183.00	— source file
Tri-City Medical Center Oceanside · San Diego-Chula Vista-Carlsbad, CA Free T4 Level	$114.26	$190.44	May 29, 2026 source file
Providence Health System - Southern California Mission Hills · Los Angeles-Long Beach-Anaheim, CA HC ASSAY OF FREE THYROXINE CDM	$116.90	$334.00	Apr 1, 2026 source file
Madera Community Hospital Madera · Fresno, CA Thyroxine (thyroid chemical), free	$121.20	$202.00	Jul 30, 2026 source file
USC Kenneth Norris Jr Cancer Hospital Los Angeles · Los Angeles-Long Beach-Anaheim, CA Assay Of Free Thyroxine	$126.75	$126.75	Apr 1, 2026 source file
Keck Hospital of USC Los Angeles · Los Angeles-Long Beach-Anaheim, CA Assay Of Free Thyroxine	$143.75	$143.75	Apr 1, 2026 source file
USC Verdugo Hills Hospital Glendale · Glendale, CA Assay Of Free Thyroxine	$153.75	$153.75	Apr 1, 2026 source file
UCI Health - Lakewood Orange · Los Angeles-Long Beach-Anaheim, CA THYROXINE FREE	$159.60	$399.00	Apr 1, 2026 source file
Tahoe Forest Hospital District Truckee · Truckee-Grass Valley, CA Thyroxine (thyroid chemical), free	$171.00	$171.00	Jul 6, 2026 source file
San Antonio Regional Hospital Upland · Riverside-San Bernardino-Ontario, CA Thyroxine (thyroid chemical), free	$185.00	$532.00	Apr 2, 2026 source file
County of Monterey Salinas · Salinas, CA Thyroxine (thyroid chemical), free	$218.00	$218.00	Aug 14, 2026 source file
Hospital of Barstow INC Barstow · Riverside-San Bernardino-Ontario, CA Thyroxine (thyroid chemical), free	$229.89	$383.15	Sep 17, 2026 source file
Northbay Medical Center Fairfield · Vallejo, CA T4 Free	$230.00	$230.00	Apr 1, 2026 source file
Palo Verde Hospital Blythe · Riverside-San Bernardino-Ontario, CA Thyroxine (T4) Free Direct LC	$283.12	$377.50	Jul 1, 2026 source file
Watsonville Community Hospital Watsonville · Santa Cruz-Watsonville, CA ASSAY OF FREE THYROXINE	$487.62	$812.70	Sep 15, 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
Los Angeles-Long Beach-Anaheim, CA	32	$7.23	$52.56
Riverside-San Bernardino-Ontario, CA	15	$6.84	$29.39
San Francisco-Oakland-Fremont, CA	12	$10.80	$102.48
San Diego-Chula Vista-Carlsbad, CA	11	$9.00	$24.03
San Jose-Sunnyvale-Santa Clara, CA	5	$10.80	$43.00
Fresno, CA	4	$22.32	$62.40
Sacramento-Roseville-Folsom, CA	4	$93.80	$102.48
Santa Rosa-Petaluma, CA	4	$55.85	$56.23
Vallejo, CA	3	$102.48	$102.48
Eureka-Arcata, CA	2	$55.85	$55.85
Bakersfield-Delano, CA	1	$42.90	$42.90
Glendale, CA	1	$153.75	$153.75
Modesto, CA	1	$102.48	$102.48
Napa, CA	1	$55.85	$55.85
Ontario, CA	1	$68.12	$68.12
Richmond, CA	1	$102.48	$102.48
Redding, CA	1	$9.00	$9.00
Salinas, CA	1	$218.00	$218.00
Santa Cruz-Watsonville, CA	1	$487.62	$487.62
Stockton-Lodi, CA	1	$102.48	$102.48
Susanville, CA	1	$10.02	$10.02
Truckee-Grass Valley, CA	1	$171.00	$171.00

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.