Is FT4 thyroid 1.71 normal, high or low? What does Free thyroxine level 1.71 mean?

📅 Medical Review Date: December 13, 2025

Your FT4 thyroid level of 1.71 is a Normal FT4 thyroid level.

Normal FT4 thyroid levels may indicate underlying health problems. The normal range is typically between 0.89 ng/dL and 1.76 ng/dL. If your levels are outside this range, it's important to speak with a healthcare provider. Consulting a doctor is recommended to determine the cause and appropriate next steps.

The normal FT4 thyroid range for men is :0.89 - 1.76 ng/dL

Ideal values of FT4 thyroid depending on age (male) :

Age	Ideal FT4 thyroid value
<5 years	0.905
5-10 years	0.92
10-15 years	0.936
15-20 years	0.952
20-25 years	0.968
25-30 years	0.985
30-35 years	1.002
35-40 years	1.019
40-45 years	1.036
45-50 years	1.054
50-55 years	1.072
55-60 years	1.09
60-70 years	1.109
70-80 years	1.128
80-90 years	1.147
90-100 years	1.167
>100 years	1.187

*Ideal values are calculated based on our database of patient records

Get Advice via Email : Send us your blood test report, and our FT4 thyroid experts will review it. You'll receive a detailed analysis and personalized treatment guidance via email within 12 hours. If you have additional blood test results besides FT4 thyroid, please include those too—an accurate diagnosis often requires a full view of all abnormalities. Upload blood test report now

1,51,150

Total number of patients treated

A video message on the treatment of your normal FT4 thyroid level

If you want your blood test report to be interpreted by FT4 thyroid specialist, you can upload your report. Our FT4 thyroid expert will provide you with the most accurate interpretation of your blood test results and treatment within 12 hours.Upload blood test report now

Some examples of conditions that increase or decrease FT4 thyroid levels include:

• Autoimmune disease
• A non-functioning thyroid gland
• Thyroiditis
• Diabetes
• Liver disease

Receive world-class medical opinion about your normal FT4 thyroid levels over email.Upload blood test report now

Normal range of FT4 thyroid found among women :0.89-1.76 ng/dL

Ideal values of FT4 thyroid depending on age (female) :

Age	Ideal FT4 thyroid value
<5 years	0.906
5-10 years	0.922
10-15 years	0.938
15-20 years	0.955
20-25 years	0.972
25-30 years	0.989
30-35 years	1.006
35-40 years	1.024
40-45 years	1.042
45-50 years	1.06
50-55 years	1.079
55-60 years	1.098
60-70 years	1.117
70-80 years	1.137
80-90 years	1.157
90-100 years	1.177
>100 years	1.198

If you take a FT4 thyroid blood test and the results are not in the normal range (0.89-1.76 ng/dL), your physician may recommend more tests to figure out the problem. You might also get this test if your physician thinks you have some other disease.

This page was viewed the most from these cities in the last 30 days:

• Gummawala
• Kalathur
• La Rosière, Haute-Saône
• Khair
• Kasaraneni Vari Palem
• Laveru
• Lavalade
• Guignicourt-sur-Vence
• Labastide-Saint-Sernin
• Khatima
• Laneuveville-devant-Nancy
• Glenville, Cleveland
• La Saunière
• Irreville
• Gioia del Colle
• Gorhey
• Jirapa/Lambussie District
• Gang Khurd
• Kingdom of the Kartvels
• Gaoyi, Hebei
• Jabaranpur
• Garhgaon
• Jeolla Province
• Gopavaram
• Kafr Jammal
• Ioannina Eyalet
• Hovgaard Island
• La Motte-Ternant
• Hatai Khedi
• Kalleli
• La Gouesnière
• Langyashan
• La Roque-Sainte-Marguerite
• Joniawas
• Hugo Island
• Khardong, Leh
• Kuttoor (Thiruvalla)
• Guntur mandal
• Kappaladoddi
• Le Catelier
• Hidaka, Hokkaido
• Le Petit-Abergement
• Jigni State
• Khirbat al-Duhayriyya
• Kachiguda
• Kingdom of Libya
• La Haye-du-Puits
• Haguenau
• Kanaganakoppa
• Lafresguimont-Saint-Martin
• Kabri (Panipat)
• Kundoormala
• Kallapuliyur
• Khudaganj
• La Bohalle
• Gollaprolu
• Kitahatu
• Jouy-le-Moutier
• Golf Green
• Harponville
• Kabaena
• Koronadal
• Kulptown, Pennsylvania
• Landroff
• Khemewadi
• Guémappe
• Jamnagar district
• Greensboro, Alabama
• Haiti
• Kievan Rus'
• Houlle
• Greek military junta of 1967–74
• Gosasi
• Khajuri Kalan
• Jagmeri
• Jamia Osmania
• Khirbet Zanuta
• La Versanne
• Gignéville
• Jhinkijhari
• Harper Islands
• Hegde (village)
• Inchal
• Le Meix
• Kalra
• Kurara
• La Roche-sur-le-Buis
• Kankagrambhukti
• Kampil
• La Roque-d'Anthéron
• Gérardmer
• Komatipalli
• Kitaotao, Bukidnon
• Les Grandes-Chapelles
• Hinotiya Jagir, Huzur
• Germantown, Philadelphia
• L'Isle-en-Dodon
• Les Pieux
• Heuzecourt
• Lavit
• Kanhan (Pipri)
• Jalpaiguri (Vidhan Sabha constituency)
• Kesabpur, India
• Janesville, Wisconsin
• Hazelwood, Portland, Oregon
• Gamma Island
• Higashiōmi
• Jalore
• Lampolai
• Kennett, Missouri
• Kanti (Vidhan Sabha constituency)
• Kondotty
• Jiaonan
• La Chaussée-d'Ivry
• Guerfand
• Kullam Chinar
• La Selle-Craonnaise
• L.I.G. Colony
• Kolalapudi
• Hirekudi
• Giske
• Kandgal
• Lariyar
• Léaz
• Grado, Friuli-Venezia Giulia
• Gandicheruvu
• Les Istres-et-Bury
• Haldia (Vidhan Sabha constituency)
• Khajauli (Vidhan Sabha constituency)
• Hwanghae Province
• Gidy
• Kerem Shalom
• Iskar, Afghanistan
• Hobbs Islands
• Kalavai
• History of Hanover (region)
• Le Faouët, Côtes-d'Armor
• Jiutai District
• Jeppu
• L. E. Emerson
• Kattakudi
• Lahaymeix
• Kambare N.m
• Jefferson Crossroads, Delaware
• La Ward, Texas
• Kotla Surajmal
• Giniwara
• History of the Transitional Federal Government of the Republic of Somalia
• Kingdom of Galicia
• Kottigehara

How the FT4 thyroid Test Is Done :

When your doctor orders a FT4 thyroid test, it involves a straightforward blood draw to measure your FT4 thyroid levels. A pathologist or lab technician will take a small sample of blood from a vein using a needle. Your FT4 thyroid test results are usually available within a few hours.

Medical References

• MedlinePlus – Thyroxine (T4) Test
• Cleveland Clinic – T4 (Thyroxine) Test: What It Is, Function, Purpose & Levels
• MedlinePlus – Free T4 test
• WebMD – What Is a Thyroxine (T4) Blood Test?
• Mayo Clinic – Hypothyroidism (underactive thyroid) - Diagnosis and treatment